Real-world walking activity is important for poststroke patients because it leads to their participation in the community and physical activity. Walking activity may be related to adaptability to different surface conditions of the ground. The purpose of this study was to clarify whether walking adaptability on an uneven surface by step is related to daily walking activity in patients after stroke. We involved 14 patients who had hemiparesis after stroke and 12 healthy controls. The poststroke patients were categorized (...) as least limited community ambulators or unlimited ambulators. For the uneven surface, the study used an artificial grass surface. The subjects repeated even surface walking and the uneven surface walking trials at least two times at a comfortable speed. We collected spatiotemporal and kinematic gait parameters on both the even and uneven surfaces using a three-dimensional motion analysis system. After we measured gait, the subjects wore an accelerometer around the waist for at least 4 days. We measured the number of steps per day using the accelerometer to evaluate walking activity. Differences in gait parameters between the even and uneven surfaces were calculated to determine how the subjects adapted to an uneven surface while walking. We examined the association between the difference in parameter measurements between the two surface properties and walking activity. Walking activity significantly and positively correlated with the difference in paretic step length under the conditions of different surface properties in the poststroke patients and step width in the healthy controls. The strategy of increasing the paretic step length, but not step width, on an uneven surface may lead to a larger base of support, which maintains stability during gait on an uneven surface in poststroke patients, resulting in an increased walking activity. Therefore, in poststroke patients, an increase in paretic step length during gait on an uneven surface might be more essential for improving walking activity. (shrink)

There is growing interest in the effect of sound on visual motion perception. One model involves the illusion created when two identical objects moving towards each other on a two-dimensional visual display can be seen to either bounce off or stream through each other. Previous studies show that the large bias normally seen toward the streaming percept can be modulated by the presentation of an auditory event at the moment of coincidence. However, no reports to date provide sufficient (...) evidence to indicate whether the sound bounce-inducing effect is due to a perceptual binding process or merely to an explicit inference resulting from the transient auditory stimulus resembling a physical collision of two objects. In the present study, we used a novel experimental design in which a subliminal sound was presented either 150 ms before, at, or 150 ms after the moment of coincidence of two disks moving towards each other. The results showed that there was an increased perception of bouncing when the subliminal sound was presented at or 150 ms after the moment of coincidence compared to when no sound was presented. These findings provide the first empirical demonstration that activation of the human auditory system without reaching consciousness affects the perception of an ambiguous visual motion display. (shrink)

Syntactic templates serve as schemas, allowing speakers to describe complex events in a systematic fashion. Motion events have long served as a prime example of how different languages favor different syntactic frames, in turn biasing their speakers toward different event conceptualizations. However, there is also variability in how motion events are syntactically framed within languages. Here, we measure the consistency in event encoding in two languages, Spanish and Swedish. We test a dominant account in the literature, namely that (...) variability within a language can be explained by specific properties of the events. This event-properties account predicts that descriptions of one and the same event should be consistent within a language, even in languages where there is overall variability in the use of syntactic frames. Spanish and Swedish speakers (N= 84) described 32 caused motion events. While the most frequent syntactic framing in each language was as expected based on typology (Spanish: verb-framed, Swedish: satellite-framed, cf. Talmy,2000), Swedish descriptions were substantially more consistent than Spanish descriptions. Swedish speakers almost invariably encoded all events with a single syntactic frame and systematically conveyed manner of motion. Spanish descriptions, in contrast, varied much more regarding syntactic framing and expression of manner. Crucially, variability in Spanish descriptions was not mainly a function of differences between events, as predicted by the event-properties account. Rather, Spanish variability in syntactic framing was driven by speaker biases. A similar picture arose for whether Spanish descriptions expressed manner information or not: Even after accounting for the effect of syntactic choice, a large portion of the variance in Spanish manner encoding remained attributable to differences among speakers. The results show that consistency in motion event encoding starkly differs across languages: Some languages (like Swedish) bias their speakers toward a particular linguistic event schema much more than others (like Spanish). Implications of these findings are discussed with respect to the typology of event framing, theories on the relationship between language and thought, and speech planning. In addition, the tools employed here to quantify variability can be applied to other domains of language. (shrink)

Motion pose capture technology can effectively solve the problem of difficulty in defining character motion in the process of 3D animation production and greatly reduce the workload of character motion control, thereby improving the efficiency of animation development and the fidelity of character motion. Motion gesture capture technology is widely used in virtual reality systems, virtual training grounds, and real-time tracking of the motion trajectories of general objects. This paper proposes an attitude estimation algorithm (...) adapted to be embedded. The previous centralized Kalman filter is divided into two-step Kalman filtering. According to the different characteristics of the sensors, they are processed separately to isolate the cross-influence between sensors. An adaptive adjustment method based on fuzzy logic is proposed. The acceleration, angular velocity, and geomagnetic field strength of the environment are used as the input of fuzzy logic to judge the motion state of the carrier and then adjust the covariance matrix of the filter. The adaptive adjustment of the sensor is converted to the recognition of the motion state. For the study of human motion posture capture, this paper designs a verification experiment based on the existing robotic arm in the laboratory. The experiment shows that the studied motion posture capture method has better performance. The human body motion gesture is designed for capturing experiments, and the capture results show that the obtained pose angle information can better restore the human body motion. A visual model of human motion posture capture was established, and after comparing and analyzing with the real situation, it was found that the simulation approach reproduced the motion process of human motion well. For the research of human motion recognition, this paper designs a two-classification model and human daily behaviors for experiments. Experiments show that the accuracy of the two-category human motion gesture capture and recognition has achieved good results. The experimental effect of SVC on the recognition of two classifications is excellent. In the case of using all optimization algorithms, the accuracy rate is higher than 90%, and the final recognition accuracy rate is also higher than 90%. In terms of recognition time, the time required for human motion gesture capture and recognition is less than 2 s. (shrink)

In recent years, with the rapid development of computer storage capabilities and network transmission capabilities, users can easily share their own video and image information on social networking sites, and the amount of multimedia data on the network is rapidly increasing. With the continuous increase of the amount of data in the network, the establishment of effective automated data management methods and search methods has become an increasingly urgent need. This paper proposes a retrieval method of human motion data (...) based on motion capture in index space. By extracting key frames from the original motion to perform horizontal dimensionality reduction and defining features based on Laban motion analysis, the motion segment is subjected to vertical feature dimensionality reduction. After extracting features from the input motion segment, motion matching is performed on the index space. This paper designs the optimization method of the phased dynamic time deformation algorithm in time efficiency and analyzes the optimization method of the phased dynamic time deformation algorithm in time complexity. Considering the time efficiency redundancy, this paper optimizes the time complexity of the phased dynamic time deformation method. This improves the time efficiency of the staged dynamic time warping algorithm, making it suitable for larger-scale human motion data problems. Experiments show that the method in this paper has the advantage of speed, is more in line with the semantics of human motion, and can meet the retrieval requirements of human motion databases. (shrink)

In a now famous thought experiment, Frank jackson asked us t0 imagine an omniscient scientist, Mary, who is coniincd in a black-and-white room and then released into the world 0f color . Assuming that she is omniscicnt in respect of all physical facts—roughiy, all the facts available to physics and all the facts that they in turn Hx or determine-physicalism would suggest that there is no new fact Mary can discover after emancipation; physicalism holds that all facts are physical (...) in the relevant sense . Yet we cannot help but feel that coming out of that room would be an occasion of dramatic enlightenment and, in particular, an occasion for learning facts to do with how red or yellow or blue 100ks or, as it is usually said, with what it is like t0 sec red or yellow or blue. Many in the black-and—whit<—: room knew all the physical facts about the world, where these may be taken to include three sorts of color facts: objcctual facts, as to what surface colors different objects have, assuming as I shall do throughout—that colors are properties of objects; intentional facts, as to which colors different objects 0r apparent objects are represented as having in the subjc-:ct’s experience, rightly or wrongly; and nonintentional facts, about what such color experiences are like in their effects on subiccts—wh<—:ther they are comforting, or arousing, or whatever. But, according to the argument, Mary didn’t know how any color looks or, equivalently, what color experience is like in itself, not just in its effects O1'1 subjects. This particular nonintentional fact about the quality of color c-zxpc-2ri<—:ncc-—this phenomenal fact, as it is often describcd—she did not. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Philosophy 41.1 (2003) 136-137 [Access article in PDF] John Watkins. Human Freedom after Darwin: A Critical Rationalist View. Chicago: Open Court Publishing, 1999. Pp. xi + 348. Cloth, $49.95. Paper, $24.95. John Watkins examines man's place in nature since Darwin. As a critical rationalist, using the methods of science, Watkins hopes to construct a world-view which challenges competing hypotheses and supports his own. (...) He recognizes that his view is, also, a candidate for critical rejection. All scientific views are, in principle, fallible. He divides his book into two parts: Naturalism and Freedom. [End Page 137]In evolutionary development, he accepts, as critically established, the sequence: matter before life, life before mind, and, no mind without a brain. Thus, naturalism is preferred beforesupernaturalism or divine intervention. These guides may support a continuous, steady evolutionaryprocess or discontinuity, mutations, and various stages of change. Darwin acceptedthe former and held physical changes were unaffected by consciousness. All change is, in principle,present from the beginning and unfolds over time. Darwin's view, then, is deterministic.Watkins challenges this position and argues for consciousness affecting physical change in new and unpredictable ways. It is herein that the possibility of animal and human freedom lies. Watkins gives examples of the actions of the hunter and hunted among animals, and of strategies developed by humans during crises, to support the view that there are novel and unpredictable actions by conscious beings. These actions can hardly be called predetermined in the nature of things. There is a huge difference between a general genetic structure for kinds of behavior and specific actions during crises (not that these are the only instances of freedom). At any rate, there is a reciprocal action between an individual and its environment and not merely a unilinear one.In Part II, Freedom, Watkins examines some classical, philosophical views of human freedom. He gives brief, but penetrating, analyses of Hobbes, Descartes, Hume, Kant, Schopenhauer, and Spinoza. Either they account for human action in strictly physical terms that are causally deterministic or they turn to non-empirical sources that are not verifiable. Since the latter make no difference in our account of behavior, they are entities multiplied beyond necessity. Those who give a completely deterministic view—Hobbes, Hume, and Schopenhauer—offer no continuum between cause and chance. Chance turns out to depend upon our ignorance of causes; further examination would show it causally determined.Watkins seems most sympathetic to Spinoza's treatment. In his hard-headed naturalism, Spinoza rejects any non-natural or supernatural accounts of human behavior. He is a strict determinist where man's confrontation with nature is concerned. Human emotions are passive and react to our environment; they do not affect it. Human reason makes no difference, but in its capacity to contemplate eternal truths it offers a way out. Instead of reacting to nature, man may transcend it. This transcendence is the key to Spinoza's view of the intellectual love of God, and human freedom. Watkins criticizes this flight from man's place in nature and the limited use of reason. In this vein, Spinoza seems to abandon the confrontation of nature for a flight to eternal truths. For Watkins, however, reasons must be used in confronting nature. As we saw, he claims that reason may have an effect upon the environment that is novel and unpredictable. Human agency is a part of the evolutionary story. Human agency is not an either/or proposition. There are degrees of effectiveness in human response to nature.In his analysis of human freedom, Watkins turns to the works of Newton, Faraday, Einstein, and others. In studying the problems posed by the consideration of natural phenomena during their time, they showed intellectual perspicacity of the highest order. Faraday's unified field theory brought electrical and magnetic phenomena, previously thought to be disparate, together. Newton's laws of motion brought celestial and terrestrial mechanics under one theory. Einstein changed the way in which space, time, mass, energy, and light were conceived. In a real sense, they were... (shrink)

The simultaneous recording of brain activity in two or more people, termed hyperscanning, is an emerging field of research investigating the neural basis of social interaction. Hyperscanning studies of adult–infant dyads have great potential to provide insights into how social functions develop. In particular, taking advantage of functional near-infrared spectroscopy for its spatial resolution and invulnerability to motion artifacts, adult–infant fNIRS may play a major role in this field. However, there remains a problem in analyzing hyperscanning data between adult (...) and young populations. Namely, there are intrinsic differences in hemodynamic time latencies depending on age, and the peak latency of the hemodynamic response function is longer in younger populations. Despite this fact, the effects of such differences on quantified synchrony have not yet been examined. Consequently, the present study investigated the influence of intrinsic hemodynamic differences on wavelet coherence for assessing brain synchrony, and further examined the statistical removal of these effects through simulation experiments. First, we assumed a social signal model, where one counterpart of the dyad sends a social signal to the other, which eventually results in simultaneous brain activation. Based on this model, simulated fNIRS activation sequences were synthesized by convolving boxcar event sequences with HRFs. We set two conditions for the event: synchronized and asynchronized event conditions. We also modeled the HRFs of adults and infants by referring to previous studies. After preprocessing with additional statistical processing, we calculated the wavelet coherence for each synthesized fNIRS activation sequence pair. The simulation results showed that the wavelet coherence in the synchronized event condition was attenuated for the combination of different HRFs. We also confirmed that prewhitening via an autoregressive filter could recover the attenuation of wavelet coherence in the 0.03–0.1 Hz frequency band, which was regarded as being associated with synchronous neural activity. Our results showed that variability in hemodynamics affected the analysis of inter-brain synchrony, and that the application of prewhitening is critical for such evaluations between adult and young populations. (shrink)

Prolonged trunk flexion is known to affect passive and active stabilization of the trunk. Previous studies have evaluated changes in spinal range of motion, muscle activity and reflex behavior induced by prolonged trunk flexion, whereas the effect on sitting postural control is vastly underexplored. In this study, we compared the effects of supported and unsupported intermittent trunk flexion on center of pressure motion during sitting on an unstable seat. Participants were exposed to 1-h intermittent trunk flexion and (...) CoP root mean square distance, velocity and frequency before and after the exposure were assessed. Contrary to our hypothesis, there were no main effects of exposure, no main effects of condition, and no interaction between exposure and condition. Our results indicate that prolonged intermittent flexion does not induce any changes in CoP motion during a seated balance task, regardless of the presence of a trunk support during prolonged intermittent flexion. This suggests a successful compensation of decreased passive stiffness by increased reflex activity. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Philosophy 41.1 (2003) 136-137 [Access article in PDF] John Watkins. Human Freedom after Darwin: A Critical Rationalist View. Chicago: Open Court Publishing, 1999. Pp. xi + 348. Cloth, $49.95. Paper, $24.95. John Watkins examines man's place in nature since Darwin. As a critical rationalist, using the methods of science, Watkins hopes to construct a world-view which challenges competing hypotheses and supports his own. (...) He recognizes that his view is, also, a candidate for critical rejection. All scientific views are, in principle, fallible. He divides his book into two parts: Naturalism and Freedom. [End Page 137]In evolutionary development, he accepts, as critically established, the sequence: matter before life, life before mind, and, no mind without a brain. Thus, naturalism is preferred beforesupernaturalism or divine intervention. These guides may support a continuous, steady evolutionaryprocess or discontinuity, mutations, and various stages of change. Darwin acceptedthe former and held physical changes were unaffected by consciousness. All change is, in principle,present from the beginning and unfolds over time. Darwin's view, then, is deterministic.Watkins challenges this position and argues for consciousness affecting physical change in new and unpredictable ways. It is herein that the possibility of animal and human freedom lies. Watkins gives examples of the actions of the hunter and hunted among animals, and of strategies developed by humans during crises, to support the view that there are novel and unpredictable actions by conscious beings. These actions can hardly be called predetermined in the nature of things. There is a huge difference between a general genetic structure for kinds of behavior and specific actions during crises (not that these are the only instances of freedom). At any rate, there is a reciprocal action between an individual and its environment and not merely a unilinear one.In Part II, Freedom, Watkins examines some classical, philosophical views of human freedom. He gives brief, but penetrating, analyses of Hobbes, Descartes, Hume, Kant, Schopenhauer, and Spinoza. Either they account for human action in strictly physical terms that are causally deterministic or they turn to non-empirical sources that are not verifiable. Since the latter make no difference in our account of behavior, they are entities multiplied beyond necessity. Those who give a completely deterministic view—Hobbes, Hume, and Schopenhauer—offer no continuum between cause and chance. Chance turns out to depend upon our ignorance of causes; further examination would show it causally determined.Watkins seems most sympathetic to Spinoza's treatment. In his hard-headed naturalism, Spinoza rejects any non-natural or supernatural accounts of human behavior. He is a strict determinist where man's confrontation with nature is concerned. Human emotions are passive and react to our environment; they do not affect it. Human reason makes no difference, but in its capacity to contemplate eternal truths it offers a way out. Instead of reacting to nature, man may transcend it. This transcendence is the key to Spinoza's view of the intellectual love of God, and human freedom. Watkins criticizes this flight from man's place in nature and the limited use of reason. In this vein, Spinoza seems to abandon the confrontation of nature for a flight to eternal truths. For Watkins, however, reasons must be used in confronting nature. As we saw, he claims that reason may have an effect upon the environment that is novel and unpredictable. Human agency is a part of the evolutionary story. Human agency is not an either/or proposition. There are degrees of effectiveness in human response to nature.In his analysis of human freedom, Watkins turns to the works of Newton, Faraday, Einstein, and others. In studying the problems posed by the consideration of natural phenomena during their time, they showed intellectual perspicacity of the highest order. Faraday's unified field theory brought electrical and magnetic phenomena, previously thought to be disparate, together. Newton's laws of motion brought celestial and terrestrial mechanics under one theory. Einstein changed the way in which space, time, mass, energy, and light were conceived. In a real sense, they were... (shrink)

Christian Doppler, an Austrian physicist, described in 1842 the apparent change in frequency of a wave when motion of the source or the observer is involved. Named after him, this change in observational frequencies is known as the Doppler Effect. The formula for calculating the frequency change is taught in universities, textbooks, Youtube, and on the internet. Understanding the Doppler effect is used in applications such as radar. Yet, the formula is wrong, yielding a different result (...) when applying the same velocity, once to the source, then to the observer. This article will show the formula, the error, the correction to the formula, and how it disproves Einstein’s theories of special and general relativity. (shrink)

Zeno's famous paradox of the flying arrow, and the statements made in efforts to solve it by Hegel and Engels to the effect that a moving body is, at a given instant, both in and not in a given place, reveal, on the one hand, the objective contradictoriness of motion and, on the other, the difficulty of explaining it within the framework and method of formal logic. The elevation of the laws of formal logic to an absolute, and (...) the exaggeration of its role have led certain writers to deny the truth of Hegel's and Engels' statement. It was shown that no body can simultaneously be and not be in a given place, and that, in describing motion, one should, instead of employing this mode of expression, merely say that the body is shifting, and successively passes one point after another. This passage is motion as an objectively non-contradictory process. (shrink)

Postural instability and balance impairment are disabling symptoms in patients with acute unilateral peripheral vestibular hypofunction. Vestibular rehabilitation is known to improve the vestibular compensation process, but its effect on posture recovery remains poorly understood, little is known about when VR must be done, and whether the degree of vestibular loss matters is uncertain. We analyzed posture control under static and dynamic postural tasks performed in different visual conditions [eye open ; eyes closed ; and optokinetic stimulation] using dynamic (...) posturography. Non-linear analyses of the postural performance were performed in two groups of patients with UVH subjected to the same VR program based on the unidirectional rotation paradigm and performed either early or later after vertigo attack. Distribution of the angular horizontal vestibulo-ocular reflex gain values recorded on the hypofunction side before rehabilitation differentiated two distinct sub-groups with aVOR gains below or above 0.20. The postural performance of the four sub-groups of patients with UVH tested before VR showed significantly altered postural parameters compared with healthy controls. Greater instability, higher energy to control posture, larger sway without feedback corrections, and lower time of automatic control of posture were observed in static conditions. The four sub-groups recovered near-normal postural performance after VR in the EO and EC conditions, but still exhibited altered postural performance with optokinetic stimulation. In dynamic posturography conditions and before VR, the percentage of patients able to perform the postural tasks with EC and optokinetic stimulation was significantly lower in the two sub-groups with aVOR gain <0.20. After VR, the improvement of the postural parameters depended on the stage of rehabilitation and the degree of vestibular hypofunction. The best balance function recovery was found in the sub-group with early VR and pre-rehabilitation aVOR gain above 0.20, the worst in the sub-group with late rehabilitation and aVOR gain below 0.20. These differences were seen when the vestibular input remains the main sensory cue to control balance, that is, on unstable support without vision or altered visual motion cues. These findings extend to dynamic balance recovery the crucial roles of early rehabilitation and degree of vestibular hypofunction which we have already highlighted for vestibulo-ocular reflex recovery. (shrink)

The visual prediction that Nijhawan proposes cannot explain why the flash-lag effect depends on what happens after the flash. Moreover, using a visual prediction based on retinal image motion to compensate for neuronal time delays will seldom be of any use for motor control, because one normally pursues objects with which one intends to interact with ones eyes.

Spasticity and muscle weakness is common in children with cerebral palsy (CP). Spasticity can be treated with Botulinum Neurotoxin-A (BoNT-A), but this drug has also been reported to induce muscle weakness. Our purpose was to describe the effect on muscle strength in the lower extremities after BoNT-A injections in children with cerebral palsy. A secondary aim was to relate the effect of BoNT-A to gait pattern and range of motion. Twenty children with spastic cerebral palsy were (...) included in the study, eight girls and 12 boys (mean age 7.7 years). All were able to walk without support, but with increased muscle tone interfering with motor function and gait pattern. Sixteen children had unilateral spastic CP and four bilateral spastic CP. Twenty-four legs received injections with BoNT-A in the plantar flexor muscles. The children were tested before treatment, around six weeks after at the peak effect of BoNT-A, and at six months after treatment, with measurement of muscle strength, gait analysis and range of motion. There were no differences in muscle strength in plantar flexors of treated legs at peak effect compared to baseline. Six months after treatment, there was still no change in untreated plantar flexor muscles, but an increasing trend in plantar flexor strength in legs treated with BoNT-A. Parents reported positive effects in all children, graded as: small in three children, moderate in eight, and large in nine children. The gait analysis showed a small improvement in knee extension at initial contact, and there was a small increase in passive range of motion for ankle dorsiflexion. Two children had a period with transient weakness and pain. We found that voluntary force production in plantar flexor muscles did not decrease after BoNT-A, instead there was a trend to increased muscle strength at follow-up. The increase may be explained as an effect of the blocking of involuntary nerve impulses, leading to an opportunity to using and training the muscles with voluntary control. Adequate muscle strength is important for maintaining the ability to walk and knowledge of how a treatment affects muscle strength is useful when selecting interventions. (shrink)

An overview of the history of the concept of matter highlights the fact that alternative modes of explanation were successively employed. With the discovery of irrational numbers the initial conviction of the Pythagorean School collapsed and was replaced by an exploration of space as a principle of understanding. This legacy dominated the medieval period and had an after-effect well into modernity—for both Descartes and Kant still characterized matter in spatial terms. However, even before Galileo the mechanistic world view (...) slowly entered the scene—the world as chaos, particles in motion. Elevating movement to become the guiding principle in our understanding of matter dominated the main tendency of modern physics until the (end of the) 19th century. The discovery of irreversible processes (radio-activity for example) directed 20th century physics towards an exploration of the meaning of energy-operation. It turned out that even within 20th century physics long-standing legacies prevailed, because an account of the nature of matter continued to be torn apart by atomistic and holistic views—confronted by the problem of constancy and change (radical transformability versus persistence). Concrete, material reality exceeds the scope of any single mode of explanation—an insight that also serves a better understanding of the wave-particle duality. (shrink)

In this paper, I discuss the use of after-effects as a criterion for showing that we can perceive high-level properties. According to this criterion, if a high-level property is susceptible to after-effects, this suggests that the property can be perceived, rather than cognized. The defenders of the criterion claim that, since after-effects are also present for low-level, uncontroversially perceptual properties, we can safely infer that high-level after-effects are perceptual as well. The critics of the criterion, on (...) the other hand, assimilate it to superficially similar effects in cognition and argue that the after-effect criterion is a cognitive phenomenon rather than a perceptual one, and that as a result it is not a reliable guide for exploring the contents of perception. I argue against both of these views and show that high-level after-effects cannot be identified either with low-level after-effects or with cognitive biases. I suggest an intermediate position: high-level after-effects are not cognitive, but they are nonetheless not a good criterion for exploring the contents of perception. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Minutes of the Annual General Meeting 2023Cornelis de Waal, Editor-in-Chief, Richard Kenneth Atkins, André De Tienne, Director and General Editor, and Elizabeth Cooke[as approved on January 17, 2024]The Annual General Meeting of the Charles S. Peirce Society was held in conjunction with the Eastern Division Meeting of the APA on January 5, 2023, at the Sheraton Le Centre, Montréal, Quebec. Rosa Maria Mayorga chaired the meeting and called it (...) to order at 12:38 p.m.1. Moment of SilenceThe annual meeting began with a moment of silence in memory of Peirce scholars who passed away in the last year.2. Approval of Minutes of the 2022 MeetingMinutes of the 2022 Annual General Meeting had been posted online. Copies were also distributed at the annual meeting. Rosa Maria Mayorga asked for a motion to approve the minutes. James Liszka so moved and Fabienne Forster seconded. The minutes were approved unanimously.3. Report from the Executive CommitteeRichard Kenneth Atkins submitted the following report.The Executive Committee Meeting was held virtually via email. All members of the Executive Committee were contacted and responded regarding the agenda and items.Agenda Items(A) Non-profit Status Update:On December 5, 2022, we received notification from the IRS that we have been legally approved as a public non-profit foundation.(B) Funding for Scholarship:Every year, we set aside a certain amount of funding for scholarship, usually 2/3rds of the year's income. This includes the $1,000 set aside for the Peirce Essay prize. Atkins reported that the income this past year was $6,597.06. 2/3rds of that is $4,400. Atkins requested that that amount of money be set aside for funding for scholarship, with which the committee unanimously agreed.(C) Next Year's AGM:Atkins proposed that we continue to hold our annual conference in conjunction with the E-APA in New York, NY, especially as this keeps us in line with the calendar year which is also our fiscal year as a nonprofit. The committee unanimously agreed. [End Page 118](D) Any Other Business:Cornelis de Waal suggested that we add to the agenda for the annual business meeting a moment of silence to commemorate Peirce scholars who passed this year. The Executive Committee unanimously agreed.4. Report from the Transactions of the Charles S. Peirce SocietyCornelis de Waal submitted the following report on behalf of the Transactions of the Charles S. Peirce Society. Richard Kenneth Atkins read the report on his behalf.During the 2022 calendar year we produced four issues of the Transactions. We encountered some problems with the first issue, because the printer suffered a ransomware attack. This apparently wreaked havoc with their system and caused significant delay in the completion of the issue.Likely due to the (after) effects of the pandemic, quality submissions to the journal were down significantly, both in the Peirce segment and in the non-Peirce segment of the journal. In addition, there was a significant drop in book reviews. The latter led to the resignation of our long-term book review editor, Henrik Rydenfelt. For the last two months I have been taking over for him, and I'm first-hand experiencing some of the challenges, even including publishers simply not following through on requests for books. We did, though, publish a book symposium on James Liszka's Charles Peirce on Ethics, Esthetics and the Normative Sciences, and we have another book symposium forthcoming on Chris Voparil's Reconstructing Pragmatism: Richard Rorty and the Classical Pragmatists. Besides a number of excellent papers on Peirce, we published some very nice papers in American philosophy. The latter include an extensive portrait of Edwin Bissell Holt, a discussion of the use of the term pragmatism in 18th century Germany, the first English translation of two texts by Wilhelm Jerusalem, as well as work on George Santayana, Jonathan Edwards, and Emily Dickinson.With Henrik gone, the editorial team is now down to Robert Lane and me (hopefully briefly returning to the traditional Robin-Hare setup). I'll be attending the upcoming SAAP meeting in Denver, and Bob is planning to attend as well... (shrink)

This piece, included in the drift special issue of continent. , was created as one step in a thread of inquiry. While each of the contributions to drift stand on their own, the project was an attempt to follow a line of theoretical inquiry as it passed through time and the postal service(s) from October 2012 until May 2013. This issue hosts two threads: between space & place and between intention & attention . The editors recommend that to experience the (...) drifiting thought that attention be paid to the contributions as they entered into conversation one after another. This particular piece is from the BETWEEN INTENTION & ATTENTION thread: Jeremy Fernando, Sitting in the Dock of the bay, watching... * R.H. Jackson, Reading Eyes * Gina Rae Foster, Nyctoleptic Nomadism: The Drift/Swerve of Knowing * Bronwyn Lay, Driftwood * Patricia Reed, Sentences on Drifitng * David Prater, drift: a way * * * * "… to sleep perchance to dream " 1 To dream: to be not quite asleep, yet not particularly awake. Or, rather: to be awake but not quite know it. For, it is only when we dream, when we are dreaming, that we know that we are not in that final sleep. But we can only know that we are dreaming, that we have dreamt, when we are awake, when we have awoken; after it is too late. When all we know is that the sleep beyond finitude, the sleep that is the step beyond, is not yet upon us, is only to come. To die to sleep … To dream: a sleep that refuses sleep. Perchance to dream: to drift—between sleep and sleep. Aye there's the rub For, can we even know if we have been sleeping? Or, if death has claimed us?—even if a little death. α Ω α Ω α Ω To drift: but from, to, what? For, to drift implies a certain direction that one was headed from, heading to, headed for; without these indications, markers, points in relation with each other, one would just be moving. Can one know—intend—one's drift? Certainly a stunt driver would say so. But even as (s)he is starting her slide, all that (s)he can know is that she is setting the car, herself, the car with herself in it, in motion: after which the drift itself takes over. After which, all (s)he can do is attend to it. At the point of the drift: both (s)he and the car are drifting—here, one might not even be able to separate the movement from those involved in it. Without either of them, there would not be a drift; there is no drifting without the drifter. Both the drifter and the drifting are in a relationality; in which, all that they can know is that they are in relation with each other. Hence, the drift itself is a relationality. A non-essence. But, it is not as if we cannot speak of it. Perhaps though: we can only speak of it as if we can speak of it. Always already an imaginary gesture; where what is being imagined is the relationality between the drift and the ones drifting. Thus, we have a situation where the drifter and drifting are in a relationality; where relationality itself is what is being imagined. Perhaps then, what are we drifting from, to? , is a moot question. As is, what is drifting? Perhaps then, all we can say is drift? To speak of drift is an attempt to speak of the unspeakable. Not that what is speakable and what is unspeakable are antonyms: if that were so, speaking the unspeakable would make no sense, be a contradiction. But that in every act of speaking, something unspeakable is potentially said: something that opens, ruptures, wounds even. And not just that—at the point where it punctures, speaking itself moves out of the way for the unspeakable; speaking itself disappears. "… the whole art is to know how to disappear before dying, and instead of dying. " 2 To disappear; or, to drift out of sight. Where the words themselves slip away. After all: "in the Beginning was the Word. It was only afterwards that Silence came." Perhaps the wish, the hope, is that "the end itself has disappeared …" (Baudrillard, 70) Remaining hidden from us. Perhaps only glimpsed when we dream. Secret. α Ω α Ω α Ω " Bury all your secrets in my skin " (Corey Taylor) Which is the problem: words cling. And they remain. Perhaps not ontologically; but they certainly remain to haunt us. And here, we should not forget Lucretius' lesson that communication occurs in the skin between the parties in communion with each other. Which is not to say that the encounter is determined by atoms—and more precisely atoms that move in straight lines until they collide with each other—that communication is pre-determined. For, one must not forget that will is found, discovered, enacted even, at the moment the atoms swerve. Clinamen . Drift. But even in their movement—drifting—they trace themselves into the skin between; a tangential touching. Perhaps only briefly. But even then, enough … "… there's always texture that betrays the place." (May Ee Wong) Here though, one must not forget that betrayal cannot happen in the absence of love. In fact, betrayal is the very excess of love: where one loves the other so much that one can no longer bear to see the other drift from what (s)he could have been. Whether that idealised other exists or is only in one's head is another question altogether. Perhaps, a fetishised other: keeping in mind that "fetishes are hinged around simulation." After all, "when one is supposed to show up as an oil rig diver no one is expecting actual crude oil" (Amanda Sordes); in fact, actualisation is the perfect way to destroy the fantasy. Perhaps then, the only way to maintain love for another is to maintain a proper distance, as it were, from love: allow the love to constantly alter, change. And here, one must not forget that if love is a relationality between one and another who remains wholly other (otherwise just a mere manifestation of the self), love is a relationality that knows nothing except for the fact that it is in a relation. For, to love one has to attend to—without subsuming another, some other, under oneself. Which means that to love, one has to be willing to risk, to open oneself, to allow oneself to be wounded, torn apart. In new ways, ways that we have yet to understand, come across, ways we do not yet have a name for. Thus, this movement in love is one that occurs in utter blindness; to not only the other, but to what love is. This is love as pure drifting. Perhaps always searching for love itself, without ever knowing what it is that it is looking for. Love: only at the very moment when the word love itself disappears. Perhaps all we can do is sit, and attend: watching the tides flowing away—as if they were having their "last swim of the summer." (Hendrik Speck) Like a butterfly. α Ω α Ω α Ω Isn't it quite amazing how the appearance of a butterfly can inject a stutter or pause into any conversation? Words and words pour out of the animals in assembly, before they are all of a sudden arrested by the passing flight. Heads turn to trace a lilting poetics, attempting to close the distance with this seemingly awkward beauty. There are no straight lines here, only a relative arrival and departure to bracket a brilliant and bewildering trajectory, surging and lurching in a vibrating and nomadic line avant la lettre. (Sean Smith, 'I Seek You: Countdown to Stereoscopic Tear') Before the letter. Before the possibility of naming. Before being sayable. Quite possibly also before language. And yet, a "surging and lurching," a movement with an effect—"vibrating and nomadic"—tracing itself before there is even anything to trace. Leaving something, even if that thing remains unknowable, for us to attend to. Drifting into us. I had some dreams they were clouds in my coffee, clouds in my coffee..." (Carly Simon) NOTES William Shakespeare, Hamlet , Act 3 Scene 1. Jean Baudrillard, Why hasn't everything already disappeared? , 25.  . (shrink)

Responding to bivalent stimuli slows subsequent performance. In prospective memory research, prospective memory targets can be considered as bivalent stimuli because they typically involve features relevant for both the prospective memory task and the ongoing task. The purpose of this study was to investigate how responding to a prospective memory target slows subsequent performance. In two experiments, we embedded the prospective memory task in a task-switching paradigm and we manipulated the degree of task-set overlap between the prospective memory task and (...) the ongoing task. The results showed consistent after-effects of responding to prospective memory targets. The specific trajectory of the slowing depended on the amount of task-set overlap. These results demonstrate that responding to prospective memory targets results in after-effects, a so far neglected cost on ongoing task performance. (shrink)

Physical Relativity explores the nature of the distinction at the heart of Einstein's 1905 formulation of his special theory of relativity: that between kinematics and dynamics. Einstein himself became increasingly uncomfortable with this distinction, and with the limitations of what he called the 'principle theory' approach inspired by the logic of thermodynamics. A handful of physicists and philosophers have over the last century likewise expressed doubts about Einstein's treatment of the relativistic behaviour of rigid bodies and clocks in motion (...) in the kinematical part of his great paper, and suggested that the dynamical understanding of length contraction and time dilation intimated by the immediate precursors of Einstein is more fundamental. Harvey Brown both examines and extends these arguments, after giving a careful analysis of key features of the pre-history of relativity theory. He argues furthermore that the geometrization of the theory by Minkowski in 1908 brought illumination, but not a causal explanation of relativistic effects. Finally, Brown tries to show that the dynamical interpretation of special relativity defended in the book is consistent with the role this theory must play as a limiting case of Einstein's 1915 theory of gravity: the general theory of relativity.Appearing in the centennial year of Einstein's celebrated paper on special relativity, Physical Relativity is an unusual, critical examination of the way Einstein formulated his theory. It also examines in detail certain specific historical and conceptual issues that have long given rise to debate in both special and general relativity theory, such as the conventionality of simultaneity, the principle of general covariance, and the consistency or otherwise of the special theory with quantum mechanics. Harvey Brown' s new interpretation of relativity theory will interest anyone working on these central topics in modern physics. (shrink)

Cinema Derrida charts Jacques Derrida's collaborations and appearances in film, video, and television beginning with 1983's Ghost Dance (dir. Ken McMullen, West Germany/UK) and ending with 2002's biographical documentary Derrida (dir. Dick and Ziering, USA). In the last half of his working life, Derrida embraced popular art forms and media in more ways than one: not only did he start making more media appearances after years of refusing to have his photo taken in the 1960s and 1970s, but his (...) philosophy started to draw more explicitly from visual culture and artistic endeavours. While this book offers explanations of this transition, it contends the image of "Jacques Derrida" that emerges from film and TV appearances remains spectral, constantly deferring a complete grasp of him. Tyson Stewart draws out the main tenets of spectrality from Derrida's seminal texts Of Grammatology and Specters of Marx and other writings, like Echographies of Television, in order to fill a gap in studies of Derrida and film. Throughout the book, he explains how various techniques and spectral effects such as slow motion, stillness, repetition, mise-en-abîme, direct address, and focus on body parts/bodily presence bring about a structure of spectrality wherein the past other returns to make impressions and ethical demands on the viewer. Drawing on communication theory and film and media studies, Cinema Derrida makes a major intervention in classical communication thought. (shrink)

After a chapter which is an introduction to and summary of the rest of the book, chapter 2 begins by criticizing various attempts to do away with theories, such as the Reichenbach-Salmon conception of theoretical truth in terms of observational consequences, and the Ramsey strategy of replacing first-order theoretical sentences by second-order nontheoretical ones; it then argues against hypothetico-deductivist theories of confirmation on the grounds that they are unable to handle the relevance of evidence to theory, whether or not (...) other formal constraints or even nonformal ones such as simplicity and explanatory power are added to those theories; it ends with an exposition of the Reichenbach-Carnap conventionalist thesis that the confirmation of hypotheses with evidence presupposes analytic principles connecting hypothetical and empirical concepts. Chapter 3 criticizes Bayesian theories of confirmation on such grounds as that the a priori arguments for Bayesian restrictions on beliefs are insufficient; that the Bayesian explanations of notions like variety of evidence, ad hocness, and simplicity are inadequate; and that they cannot account, without drastic revisions, for the relevance of evidence to theory, especially old evidence to new theory. Chapter 4 is an unsympathetic account of historically oriented philosophies of science; Lakatos’s notion of progressive research programs and Laudan’s theory of problem-solving effectiveness are found to be insufficiently precise and dubbed examples of "new fuzziness", while the Sneed-Stegmüller dynamics of theories is regarded as "a paradigm of misplaced rigor" ; and all three are criticized as unable to explicate the concept of evidential relevance. Chapter 5 is a formal and informal elaboration of the basic idea in Glymour’s account of theory and evidence, namely that confirmation or support is a three-term relation among evidence, hypothesis, and theory, so that evidence confirms an hypothesis only relative to a theory, and such that evidence e confirms hypothesis h relative to T if T with e implies, but T without e does not imply, an instance of h, and T with e does not imply a comparable hypothesis h’ different from h; the most interesting part of this chapter is a series of discussions showing how such an idea makes sense of the "methodological truisms" that it is possible selectively to test certain parts of a theory but not others, that a theory is supported better by a greater variety of evidence, that redundant or physically meaningless quantities are an undesirable feature of theories, that there are no inviolable rules, that a "white shoe" does not confirm "all ravens are black," that a theory is more useful and better supported than the set of its observational consequences, and that the hypothetico-deductive method often works. Since Glymour claims no originality for the conception of this general account, but only for its description, he plausibly thinks it necessary to apply it to some important historical cases of actual science; he does so in the next chapter by discussing at some length the structure and merits of Ptolemaic and Copernican astronomy, of Newton’s universal gravitation, of nineteenth century atomism, of Freud’s Rat Man, and of general relativity. For example, he argues convincingly that Copernicanism was better supported by the evidence available even before the telescope because it alone, and not the Ptolemaic theory, can determine some planetary properties which are presupposed by both theories, can test and confirm some common hypotheses, and can be confirmed in an essential rather than incidental manner; and though Glymour admits that the Copernicans tended to argue in terms of explanatory rather than confirmatory superiority, he sketches an interesting account of the relation between explanation and confirmation which strengthens his case. He also analyzes the text at the beginning of book 3 of Newton’s Principia and compiles a reconstruction of the intricate details of the inferential structure of the argument to universal gravitation; his impressive reconstruction clearly shows that Newton’s method is neither the inductivist one he himself thought he was following, nor the one attributed to him by Pierre Duhem, but rather one in accordance with Glymour’s so-called "bootstrap strategy" of repeatedly using the evidence from Kepler’s second and third laws, from lunar data, and from falling bodies, together with the theory consisting of the second and third laws of motion, to arrive at increasingly general instances of the principle of universal gravitation. Glymour’s account of arguments for and against the atomic theory from Thomson to Cannizzaro is his longest historical example, but he himself admits that this illustration of the bootstrap strategy is "certainly not the neatest", and rather "diffuse, and perhaps disconnected". Chapter 7 is a detailed application of the same principles to the technique known among social scientists as "causal modeling"; since such "causal models" are essentially systems of algebraic equations, Glymour’s account shows indirectly that the bootstrap strategy is applicable to any scientific theory presented as a set of algebraic equations; this, of course is not surprising, since the formal considerations with which Glymour begins the exposition of his theory in chapter 5 involve systems of algebraic equations. Chapter 8 is an attempt to apply Glymour’s theory of evidence to the very common scientific practice of curve-fitting, where one measures values of two or more quantities and then infers a functional relationship; Glymour argues that simpler polynomials are preferred because they are tested more frequently and more severely by the data and because they are more informative; but then he criticizes his own explanation and concludes that "the bootstrap procedures of chapter 5 do not seem to help the problem much more than a whit" ; this is admirably honest, but if one wants an additional logical or methodological rationale, then one would perhaps have to go to the meta-level and say that Glymour is here testing his own theory, and he is more interested in a further illustration of the bootstrap methodology even with a failed test, than he is to claim universal or exclusive validity for it. In chapter 9 Glymour uses his bootstrap theory of confirmation to criticize geometrical conventionalism; he considers the alternative theories of space or space-time proposed by conventionalists to show the radical undetermination of geometries by evidence, for example, a non-Euclidean geometry with no universal force instead of Newtonian gravitation with Euclidean geometry; he argues that such alternatives are simply not as well tested as the originals and that their equivalence to the originals is questionable. The last chapter is a brief discussion of further problems worthy of future investigation. (shrink)

An object in continuous motion is perceived ahead of the briefly flashed object, although the two images are physically aligned , the phenomenon called flash-lag effect. Flash-lag effects have been found also with other continuously changing features such as color, pattern entropy, and brightness as well as with streamed pre- and post-target input without any change of the feature values of streaming items in feature space . We interpret all instances of the flash-lag as a consequence of a (...) more fundamental property of conscious perception in general: acceleration of the speed with which samples of perceptual information become represented in explicit format immediately after the stimulation onset. Decreased visual latency of the samples of stimulus information from the streamed input leads to the relative perceptual lag for the separately flashed stimulus because it is not preceded by adjacent sensory input that would have accelerated its perception. Experimental support for the notion of perceptual acceleration is reviewed. (shrink)

Developments in both China and Russia are a challenge to political science, and more particularly to theories of political culture. Both countries are engaged in profound processes of transition involving the abandonment of totalitarianism and the adoption of market-based economies. It is, however, far from clear what form their political systems will eventually take. They are currently following strikingly different paths. Are the differences a reflection of their distinctive cultures? Or, are the differences more structural, a manifestation of their respective (...) stages of economic and social development? Or, are they merely the consequences of the idiosyncratic choices and policy decisions of the two leaderships? (shrink)

This study investigated the emotional and behavioural effects of looming threats using both recalled (self-reported valence) and real-time response measurements (facial expressions). The looming bias refers to the tendency to underestimate the time of arrival of rapidly approaching (looming) stimuli, providing additional time for defensive reactions. While previous research has shown negative emotional responses to looming threats based on self-reports after stimulus exposure, facial expressions offer valuable insights into emotional experiences and non-verbal behaviour during stimulus exposure. A face reading (...) experiment examined responses to threats in motion, considering stimulus direction (looming versus receding motion) and threat strength (more versus less threatening stimuli). We also explored the added value of facial expression recognition compared to self-reported valence. Results indicated that looming threats elicit more negative facial expressions than receding threats, supporting previous findings on the looming bias. Further, more (vs. less) threatening stimuli evoked more negative facial expressions, but only when the threats were looming rather than receding. Interestingly, facial expressions of valence and self-reported valence showed opposing results, suggesting the importance of incorporating facial expression recognition to understand defensive responses to looming threats more comprehensively. (shrink)

Motor learning is the process of updating motor commands in response to a trajectory error induced by a perturbation to the body or vision. The brain has a great capability to accelerate learning by increasing the sensitivity of the memory update to the perceived trajectory errors. Conventional theory suggests that the statistics of perturbations or the statistics of the experienced errors induced by the external perturbations determine the learning speeds. However, the potential effect of another type of error perception, (...) a self-generated error as a result of motor command updates, on the learning speeds has not been examined yet. In this study, we dissociated the two kinds of errors by controlling the perception of the aftereffect using a channel-force environment. One group experienced errors due to the aftereffect of the learning process, while the other did not. We found that the participants who perceived the aftereffect of the memory updates exhibited a significant decrease in error-sensitivity, whereas the participants who did not perceive the aftereffect did not show an increase or decrease in error-sensitivity. This suggests that the perception of the aftereffect of learning attenuated updating the motor commands from the perceived errors. Thus, both self-generated and externally induced errors may modulate learning speeds. (shrink)

Background: Lower limb spasticity after stroke is common that can affect the balance, increase the risk of falling, and reduces the quality of life.Objective: First, evaluate the effects of spasticity severity of ankle plantar flexors on balance of patients after stroke. Second, to determine the relationship between the spasticity severity with ankle proprioception, passive ankle dorsiflexion range of motion, and balance confidence.Methods: Twenty-eight patients with stroke based on the Modified Modified Ashworth Scale were divided into two groups: (...) High Spasticity Group or a Low Spasticity Group. The MMAS scores, Activities-Specific Balance Confidence Questionnaire, postural sway of both affected and non-affected limbs under the eyes open and eyes closed conditions, timed up and go test, passive ankle dorsiflexion ROM, and ankle joint proprioception were measured.Results: The ankle joint proprioception was significantly better in the LSG compared to the HSG. No significant differences were found between the LSG and HSG on all other outcome measures. There were no significant relationships between the spasticity severity and passive ankle dorsiflexion ROM, and balance confidence.Conclusion: The severity of ankle plantar flexor spasticity had no effects on balance of patients with stroke. However, the ankle joint proprioception was better in patients with low spasticity. Our findings suggest that the balance is affected regardless of the severity of the ankle plantar flexor spasticity in this group of participants with stroke. (shrink)

Prism Adaptation is a useful method to study the mechanisms of sensorimotor adaptation. After-effects following adaptation to the prismatic deviation constitute the probe that adaptive mechanisms occurred, and current evidence suggests an involvement of the cerebellum at this level. Whether after-effects are transferable to another task is of great interest both for understanding the nature of sensorimotor transformations and for clinical purposes. However, the processes of transfer and their underlying neural substrates remain poorly understood. Transfer from throwing to (...) pointing is known to occur only in individuals who had previously reached a good level of expertise in throwing, not in novices. The aim of this study was to ascertain whether anodal stimulation of the cerebellum could boost after-effects transfer from throwing to pointing in novice participants. Healthy participants received anodal or sham transcranial direction current stimulation of the right cerebellum during a PA procedure involving a throwing task and were tested for transfer on a pointing task. Terminal errors and kinematic parameters were in the dependent variables for statistical analyses. Results showed that active stimulation had no significant beneficial effects on error reduction or throwing after-effects. Moreover, the overall magnitude of transfer to pointing did not change. Interestingly, we found a significant effect of the stimulation on the longitudinal evolution of pointing errors and on pointing kinematic parameters during transfer assessment. These results provide new insights on the implication of the cerebellum in transfer and on the possibility to use anodal tDCS to enhance cerebellar contribution during PA in further investigations. From a network approach, we suggest that cerebellum is part of a more complex circuitry responsible for the development of transfer which is likely embracing the primary motor cortex due to its role in motor memories consolidation. This paves the way for further work entailing multiple-sites stimulation to explore the role of M1-cerebellum dynamic interplay in transfer. (shrink)

We can perceive not only low-level features of events such as color and motion, but also seemingly higher-level properties such as causality. A prototypical example of causal perception is the ”launching effect’: one object moves toward a stationary second object until they are adjacent, at which point A stops and B starts moving in the same direction. Beyond these motions themselves --- and regardless of any higher-level beliefs --- this display induces a vivid visual impression of causality, wherein (...) A is seen to cause B’s motion. Do such percepts reflect a unitary category of visual processing, or might there be multiple distinct forms of causal perception? While launching is often simply equated with causal perception, researchers have sometimes described other phenomena such as ”triggering’ and ”entraining’. We used psychophysical methods to determine whether these labels really carve visual processing at its joints, and how putatively different forms of causal perception relate to each other. Previous research demonstrated retinotopically specific adaptation to causality: exposure to causal launching makes subsequent ambiguous events in that same location more likely to be seen as non-causal ”passing’. Here, after replicating this effect, we show that exposure to triggering also yields retinotopically specific adaptation for subsequent ambiguous launching displays, but that exposure to entraining does not. Collectively, these results reveal that visual processing distinguishes some types of causal interactions. (shrink)