First published in 1993. Routledge is an imprint of Taylor & Francis, an informa company.

BackgroundKinarm Standard Tests is a suite of upper limb tasks to assess sensory, motor, and cognitive functions, which produces granular performance data that reflect spatial and temporal aspects of behavior. We have previously used principal component analysis to reduce the dimensionality of multivariate data using the Kinarm End-Point Lab. Here, we performed PCA using data from the Kinarm Exoskeleton Lab, and determined agreement of PCA results across EP and EXO platforms in healthy participants. We additionally examined whether further dimensionality reduction (...) was possible by using PCA across behavioral tasks.MethodsHealthy participants were assessed using the Kinarm EXO and EP. Four behavioral tasks were performed that quantified arm sensory and motor function, including position sense [Arm Position Matching ] and three motor tasks [Visually Guided Reaching, Object Hit, and Object Hit and Avoid ]. The number of components to include per task was determined from scree plots and parallel analysis, and rotation type was decided on a per-task basis. To assess agreement, we compared principal components across platforms using distance correlation. We additionally considered inter-task interactions in EXO data by performing PCA across all six behavioral assessments.ResultsBy applying PCA on a per task basis to data collected using the EXO, the number of behavioral parameters were substantially reduced by 58–75% while accounting for 76–87% of the variance. These results compared well to the EP analysis, and we found good-to-excellent agreement values between PCs from the EXO and those from the EP. Finally, we were able to reduce the dimensionality of the EXO data across tasks down to 16 components out of a total of 76 behavioral parameters, which represents a reduction of 79% while accounting for 73% of the total variance.ConclusionPCA of Kinarm robotic assessment appears to capture similar relationships between kinematic features in healthy individuals and is agnostic to the robotic platform used for collection. Further work is needed to investigate the use of PCA-based data reduction for the characterization of neurological deficits in clinical populations. (shrink)

We note in Section I that an acceptable formulation of Presentism must preserve its consistency with Transient Time and inconsistency with Static Time. After arguing in Section II that certain formulations of Presentism are unacceptable, we offer in Section III a formulation of Presentism that we defend against the charge of triviality.

Abstract: Presentism is the view that whatever exists presently exists. Without defending Presentism, I argue first that Presentists should be Time-Free Presentists – Presentists whose views do not imply that there exist irreducible times. Second, I argue that Presentists should accept Limited Thick Presentism, the view that 'the present' has some extension and is thereby neither durationlessly thin nor unlimitedly 'thick'. Third, before addressing several objections to Limited Time-Free Thick Presentism [LTFTP], I argue that defenders of LTFTP should accept that (...) 'temporal becoming' involves an overlapping succession of present entities, not a 'skipping' from one set of present entities to the next discrete set. (shrink)

There has been much recent debate about Presentism among those who believe the doctrine to be nontrivial and true, those who believe it to be nontrivial and false, and those who believe it to be trivial — either trivially true or trivially false. Formulating Presentism precisely is problematic, which accounts for some of the controversy.

When is it that two objects compose a whole? Or, put another way, if Z is an object composed of X and Y, then what must be done to bring it about that X and Y both exist and Z does not exist? The author defends an answer to what is now know as the Special Composition Question.

Arguing that the universe is absolutely directioned and that there exist spatial (directional) relations that Leibniz overlooked, H. Scott Hestevold formulates a new relationalist theory of space, exploring its implications for the Special Composition Question, reductivism regarding boundaries and holes, and the nature of spacetime.

There have emerged two distinct approaches to preserving the coherence of theism. The most common approach involves explicating the concept of an absolutely perfect God in terms of the divine attributes and then analyzing the divine-attribute concepts in such a way that they are rendered mutually consistent. According to this ‘multiple-attribute’ approach, the coherence of theism ultimately turns both on whether each divine-attribute concept can be coherently analyzed independently of the other divine-attribute concepts and on whether the divine attributes are (...) then mutually consistent. (shrink)

Is consolidation needed to account for retroactive interference in free recall? Interfering mental activity during the retention interval of a memory task impairs performance, in particular if the interference occurs in temporal proximity to the encoding of the to-be-remembered information. There are at least two rival theoretical accounts of this temporal gradient of retroactive interference. The cognitive neuroscience literature has suggested neural consolidation is a pivotal factor determining item recall. According to this account, interfering activity interrupts consolidation processes that would (...) otherwise stabilize the memory representations of TBR items post-encoding. Temporal distinctiveness theory, by contrast, proposes that the retrievability of items depends on their isolation in psychological time. According to this theory, information processed after the encoding of TBR material will reduce the temporal distinctiveness of the TBR information. To test between these accounts, implementations of consolidation were added to the SIMPLE model of memory and learning. We report data from two experiments utilizing a two-list free recall paradigm. Modeling results imply that SIMPLE was able to model the data and did not benefit from the addition of consolidation. It is concluded that the temporal gradient of retroactive interference cannot be taken as evidence for memory consolidation. (shrink)

“States have no morality, they have interests,” remarked an overzealous diplomat. And in this same manner we sometimes see that reasons of state take priority over moral rules. A sweet young thing testifying before a committee of the United State Congress said “sometimes you have to put yourself above the law,” no doubt repeating something that had been said to her. At a time when unrestrained application of the reasons of state can only lead to violence that can no longer (...) be sustained, we can judge to what extent such remarks are without foundation. (shrink)

Roderick M. Chisholm’s A Realistic Theory of Categories is a metaphysics treatise of extraordinary breadth and precision. Published in the year of its author’s eightieth birthday, Categories is a lean exposition of Chisholm’s systematic metaphysics, including his views on attributes, propositions, possible worlds, numbers, classes, relations, intentionality, events, time, space, material objects, persons, appearances, fictitious objects, and God. Chisholm develops his metaphysics with the resourcefulness, elegance, and intellectual integrity that have been a hallmark of his work.

Written in debate format, this book covers developing fields such as social cognition, as well as classic areas such as memory, learning, perception and categorization. The links between emotion and memory, learning, perception, categorization, social judgements, and behavior are addressed.

Substantivalists claim that spacetime enjoys an existence analogous to that of material bodies, while relationalists seek to reduce spacetime to sets of possible spatiotemporal relations. The resulting debate has been central to the philosophy of space and time since the Scientific Revolution. Recently, many philosophers of physics have turned away from the debate, claiming that it is no longer of any relevance to physics. At the same time, there has been renewed interest in the debate among physicists working on quantum (...) gravity, who claim that the conceptual problems which they face are intimately related to interpretative questions concerning general relativity . My goal is to show that the physicists are correct--there is a close relationship between the interpretative issues of classical and quantum gravity. ;In the first part of the dissertation I challenge the received view that substantivalism has a commanding advantage over relationalism on grounds internal to GR. I argue that this view is based on a misconception of the relationships between realism and substantivalism, and between empiricism and relationalism. This has led to a narrow conception of relationalism. Once this is relinquished it can be seen that none of the standard arguments in favor of substantivalism are cogent. ;In the second part of the dissertation, I consider the way in which considerations arising out of quantum gravity bear upon the substantival-relational debate. I develop a framework in which to discuss the interpretative problems of gauge theories and place GR in this context. From this perspective, I provide a taxonomy of interpretative options, and show how the hole argument arises naturally as a consequence of gauge freedom. This means that certain substantivalist interpretations of GR render the theory indeterministic. In the final chapter, I argue that, far from being a drawback, this presents an opportunity for substantivalists. Examples from quantum mechanics, quantum field theory, and quantum gravity, are used to demonstrate that the ambiguities inherent in quantization can lead to an interpretative interplay between theories. In the case of quantum gravity, this means that substantivalism and relationalism suggest, and are suggested by, distinct approaches to quantizing GR. (shrink)

... depends on understanding their origins and roles in the cogni- THE PSYCHOLOGY OF LEARNING Copyright © by Academic Press, Inc. AND MOTIVATION, VOL. ...

Although informed consent is important in clinical research, questions persist regarding when it is necessary, what it requires, and how it should be obtained. The standard view in research ethics is that the function of informed consent is to respect individual autonomy. However, consent processes are multidimensional and serve other ethical functions as well. These functions deserve particular attention when barriers to consent exist. We argue that consent serves seven ethically important and conceptually distinct functions. The first four functions pertain (...) principally to individual participants: (1) providing transparency; (2) allowing control and authorization; (3) promoting concordance with participants' values; and (4) protecting and promoting welfare interests. Three other functions are systemic or policy focused: (5) promoting trust; (6) satisfying regulatory requirements; and (7) promoting integrity in research. Reframing consent around these functions can guide approaches to consent that are context sensitive and that maximize achievable goals. (shrink)

Implicit and explicit memory tasks are interpreted within a traditional memory theory that distinguishes associations between different classes of memory units . Associations from specific sensory features to logogens are strengthened by perceptual experiences, leading to specific perceptual priming. Associations among concepts are strengthened by use, leading to specific conceptual priming. Activating associations from concepts to logogens leads to semantic and associative priming. Item presentation also establishes a new association from it to a representation of the personal context, comprising an (...) “episodic memory.” Such contextual associations play a major role in explicit memory tasks such as recall or recognition. A critical assumption of the theory is that presentation of a given item strengthens its sensory and contextual associations independently; this permits the theory to explain various dissociations of implicit and explicit memory measures. Furthermore, by assuming that brain-injured patients with global amnesia have a selective deficit in establishing novel associations to the context, the theory can explain their deficits in explicit memory along side their intact implicit memory. (shrink)