This book offers a provocative, clear and rigorously argued account of the nature of perception and its role in the production of knowledge. Walter Hopp argues that perceptual experiences do not have conceptual content, and that what makes them play a distinctive epistemic role is not the features which they share with beliefs, but something that in fact sets them radically apart. He explains that the reason-giving relation between experiences and beliefs is what Edmund Husserl called 'fulfilment' - in (...) which we find something to be as we think it to be. His book covers a wide range of central topics in contemporary philosophy of mind, epistemology and traditional phenomenology. It is essential reading for contemporary analytic philosophers of mind and phenomenologists alike. (shrink)

While epiphenomenalism—i.e., the claim that the mental is a causally otiose byproduct of physical processes that does not itself cause anything—is hardly ever mentioned in philosophical discussions of free will, it has recently come to play a crucial role in the scientific attack on free will led by neuroscientists and psychologists. This paper is concerned with the connection between epiphenomenalism and the claim that free will is an illusion, in particular with the connection between epiphenomenalism and willusionism, i.e., with the (...) thesis that there is empirical evidence for a thoroughgoing skepticism with regard to free will that is based on the claim that mental states are epiphenomena. The paper discusses four arguments for willusionism that in some form or other appeal to epiphenomenalism and argues that three of them can be discarded relatively easily. The fourth one, based on Daniel Wegner’s theory of apparent mental causation and his claim that free will is an illusion because the feeling of conscious will is epiphenomenal with regard to the corresponding voluntary actions, is dealt with in more detail. The overall verdict is negative: there is no empirical evidence for any kind of epiphenomenalism that would warrant the claim that free will is an illusion. Whatever it is that makes free will the object of contention between neuroscience and philosophy, epiphenomenalism provides no reason to think that free will is an illusion. (shrink)

This paper discusses how to define logics as deductive limits of sequences of other logics. The case of da Costa's hierarchy of increasingly weaker paraconsistent calculi, known as $ \mathcal {C}$n, 1 $ \leq$ n $ \leq$ $ \omega$, is carefully studied. The calculus $ \mathcal {C}$$\scriptstyle \omega$, in particular, constitutes no more than a lower deductive bound to this hierarchy and differs considerably from its companions. A long standing problem in the literature (open for more than 35 years) is (...) to define the deductive limit to this hierarchy, that is, its greatest lower deductive bound. The calculus $ \mathcal {C}$min, stronger than $ \mathcal {C}$$\scriptstyle \omega$, is first presented as a step toward this limit. As an alternative to the bivaluation semantics of $ \mathcal {C}$min presented thereupon, possible-translations semantics are then introduced and suggested as the standard technique both to give this calculus a more reasonable semantics and to derive some interesting properties about it. Possible-translations semantics are then used to provide both a semantics and a decision procedure for $ \mathcal {C}$Lim, the real deductive limit of da Costa's hierarchy. Possible-translations semantics also make it possible to characterize a precise sense of duality: as an example, $ \mathcal {D}$min is proposed as the dual to $ \mathcal {C}$min. (shrink)

In this radical reinterpretation of Aristotle's Metaphysics, Walter E. Wehrle demonstrates that developmental theories of Aristotle are based on a faulty assumption: that the fifth chapter of Categories is an early theory of metaphysics that Aristotle later abandoned.

This thought-provoking book initiates a dialogue among scholars in rhetoric and hermeneutics in many areas of the humanities. Twenty leading thinkers explore the ways these two powerful disciplines inform each other and influence a wide variety of intellectual fields. Walter Jost and Michael J. Hyde organize pivotal topics in rhetoric and hermeneutics with originality and coherence, dividing their book into four sections: Locating the Disciplines; Inventions and Applications; Arguments and Narratives; and Civic Discourse and Critical Theory. Contributors to this (...) volume include Hans-Georg Gadamer, Paul Ricoeur, Gerald L. Bruns, Charles Altieri, Richard E. Palmer, Calvin O. Schrag,.Victoria Kahn, Eugene Garver, Michael Leff, Nancy S. Streuver, Wendy Olmsted, David Tracy, Donald G. Marshall, Allen Scult, Rita Copeland, William Rehg, and Steven Mailloux. For readers across the humanities, the book demonstrates the usefulness of rhetorical and hermeneutic approaches in literary, philosophical, legal, religious, and political thinking. With its stimulating new perspectives on the revival and interrelation of both rhetoric and hermeneutics, this collection is sure to serve as a benchmark for years to come. (shrink)

The idea of reduction has appeared in different forms throughout the history of science and philosophy. Thales took water to be the fundamental principle of all things; Leucippus and Democritus argued that everything is composed of small, indivisible atoms; Galileo and Newton tried to explain all motion with a few basic laws; 17th century mechanism conceived of everything in terms of the motions and collisions of particles of matter; British Empiricism held that all knowledge is, at root, experiential knowledge; current (...) physicists are searching for the GUT, the “grand unified theory,” that will show that at very high energies the electromagnetic and the weak and strong nuclear forces are fused into a single unified field. Some of these projects are clearly ontological in nature (Leucippus and Democritus), others are more methodological (mechanism), and still others strive for theoretical simplification (the projects of Galileo and Newton or the search for a GUT). Nevertheless, as they all aim at revealing some kind of unity or simplicity behind the appearance of plurality or complexity, they may all be regarded as (attempted) reductions. (shrink)

In 1999, a case was described on national television in which a woman had enlisted onto an international bone marrow registry with the altruistic desire to offer her bone marrow to some unidentified individual in need of a transplant. The potential donor then was notified that she was a compatible match with someone dying from leukemia and gladly donated her marrow, which cured the recipient of the disease. Years later, though, the recipient developed end-stage renal disease, a consequence of the (...) high-dose chemotherapy she received earlier to destroy her stem cells and prepare her for the bone marrow transplant. Finding a suitable donor for a kidney transplant proved extremely difficult. Desperate, she requested that the donor registry personnel help her locate the individual who earlier was determined to be a compatible donor and asked this now-identifiable individual to consider donating one of her two normally functioning kidneys for a kidney transplant. (shrink)

Is the Nazi euthanasia program a useful analogy for contemporary discussions of euthanasia? This paper explores the logic of slippery slope arguments with the Nazi analogy as a test case.

Although there are suggestions that the environmental attitudes of men and of women differ, there have been few studies that study and evaluate these differences at the workplace. Given the claim of Ecofeminist writers about the environmental superiority of women's environmental attitudes, and the proclaimed need of business to change attitudes and behaviour with regard to the environment, this is a surprise. The paper is based on 1022 (37% from women) questionnaires which were collected in a U.K. pharmaceutical company, and (...) it compares the empirical results with environmental attitude archetypes, such as those prescribed by O'Riordan. However, the attitude clusters that were found do not correspond greatly with such theoretical modes of environmental ethics. Instead, it appears that women were more likely to be actively involved in environmental behaviour, and showed greater scepticism towards the role of technology in the search for solutions to environmental problems. In addition, men sought to a much greater extent a consistency between an environmental rationality and their behaviour. Men's attitudes were also much more influenced by their position in the organisational hierarchy. There were few significant differences across age groups. (shrink)

Die spekulative Frage, wie das Denken sich und somit ein Selbst denken kann, ist die prinzipientheoretische Grundfrage der Philosophie. In ihr ist auch die transzendentale Frage nach den Bedingungen der Möglichkeit des Denkens eines Gegenstandes überhaupt enthalten. Wie sie darin enthalten ist und inwiefern die transzendentale Fragestellung auf die spekulative verweist und ihrer bedarf, wird im Anschluß an Kant zu zeigen sein, denn die spekulative Frage ist nicht die Ausgangsfrage Kantens. Kant geht aus von der Antinomie von empiristischem Skeptizismus und (...) ontologischem Dogmatismus und spielt sie an der Differenz von Ding und Denken durch, die dieser Antinomie zugrundeliegt. Die Ontologie wird darum von ihm belehrt, daß sie das Gedankending nicht mit dem Gegenstand der Erfahrung und das Denken nicht mit dem Erkennen verwechseln dürfe. Der Empirismus wird hingegen belehrt, daß die Gegen-stände der Erfahrung und ihre Zusammensetzungen kein Gegebenes, sondern ein vom Denken mit Bezug auf das Anschauungsmaterial Gemachtes sind. Die Differenz von Ding und Denken bleibt solcherart in Kants transzendentaler Frage nach den Bedingungen der Möglichkeit des Denkens eines Gegenstandes überhaupt aufbewahrt. Sie macht sich in Kants Antworten auf diese Frage aber auch geltend und bleibt als bloße Differenz von Verstandesspontaneität und rezeptiver Sinnlichkeit der blinde Fleck, um den seine Argumentationen kreisen. Die ersten vier Kapitel des vorliegenden Buches folgen diesem Kreisgang der Kantischen Beweisführung. Das Beweisziel: die transzendentallogische Entdeckung der Formen des Denkens eines Gegenstandes überhaupt, versuchen die Kapitel 5 und 6 einzulösen, indem - im Gegensatz zur ‚exoterischen‘ Lehre Kantens und zur nach-idealistischen Standardinterpretation des Kritizismus - die Vereinbarung von transzendentalem Idealismus und empirischem Realismus nicht in einem Apriori gesucht wird, das schlechterdings mit dem ‚Verstande‘ zu identifizieren wäre, sondern das gegenstandskonstitutive Verstandesapriori vielmehr aus ursprünglichen - die Differenz von Verstand und Sinnlichkeit allererst ermöglichenden - Weisen der Synthesis entwickelt wird. Diese genetische Grundlegung des Apriori ist anhand der Prinzipien der klassischen Logik und einer Analyse des Seinssinnes der Kopula “ist” als transzendentallogische Differenzierung der Urteilssynthesis durchzuführen und mit Bezug auf die Gegebenheitsweisen Raum und Zeit durch eine korrespondierende transzendental-phänomenologische Analyse zu vervollständigen. Da das genetische Apriori aber nicht unmittelbar, sondern nur vermittels der reflexiv-synthetischen Bewußtseinsstruktur auf die Kantischen Gegenstandskategorien bezogen werden kann, bleibt in Fortführung des Nachweises der Vollständigkeit der Kantischen Kategorientafel die spekulative Frage zu beantworten, wie Synthesis (Vermittlung) und damit das Denken selbst zu denken ist. Dieser Aufgabe und den damit untrennbar verbundenen Problemen der Verhältnisbestimmung von transzendentaler und formaler Logik, sowie von regulativer und konstitutiver Apriorität, sind die letzten vier Kapitel gewidmet, wobei in diesem Problemzusammenhang der Begriff der Transzendentalphilosophie in Auseinandersetzung mit einigen ihrer vor- und nach-kantischen Positionen noch näher zu klären sein wird. Wollte man das Ergebnis dieser Klärung vorweg zusammenfassen, dann ließe sich in Abwandlung eines oft zitierten Kantischen Satzes sagen, daß die transzendentale Logik seit Platon keinen Schritt rückwärts und mit Kant erst einen Schritt vorwärts hat tun dürfen und folglich schon von den ältesten Zeiten her nahezu vollendet sei. Vordergründig betrachtet, relativiert dieses Resultat den historischen Anspruch, den Kant an seine ‚Revolution der Denkungsart‘ geknüpft hat, es bekräftigt dafür jedoch um so mehr den systematischen Anspruch, den die Transzendentalphilosophie als Prinzipientheorie erheben und auch einlösen muß. (shrink)

Frank Jackson and Philip Pettit have defended a non-reductive account of causal relevance known as the ‘program explanation account’. Allegedly, irreducible mental properties can be causally relevant in virtue of figuring in non-redundant program explanations which convey information not conveyed by explanations in terms of the physical properties that actually do the ‘causal work’. I argue that none of the possible ways to spell out the intuitively plausible idea of a program explanation serves its purpose, viz., defends non-reductive physicalism against (...) Jaegwon Kim’s Causal Exclusion Argument according to which non-reductive physicalism is committed to epiphenomenalism because irreducible mental properties are ‘screened off’ from causal relevance by their physical realizers. Jackson and Pettit’s most promising explication of a program explanation appeals to the idea of invariance of effect under variation of realization, but I show that invariance of effect under variation of realization is neither necessary nor sufficient for causal relevance. (shrink)

In a recent set of papers, Aaron Spital has proposed conscription or routine recovery of cadaveric organs without consent as a way of ameliorating the severe shortage of organs for transplantation. Under the existing consent requirement, organs can be taken from the bodies of the deceased if they expressed a wish and intention to donate while alive. Organs may also be taken when families or other substitute decisionmakers decide on behalf of the deceased to allow organ procurement for the purpose (...) of transplantation. When patients or families do not consent to organ procurement, many transplantable organs are lost. This is a tragic yet avoidable situation. The dead are beyond any benefit or harm, and their organs could be used to prevent harm by saving and improving the lives of many people suffering and dying from end-stage organ failure. (shrink)

Ecological theory is built upon assumptions about the fundamental nature of organism-environment interactions. We argue that two mutually exclusive sets of such assumptions are available and that they have given rise to alternative approaches to studying ecology. The fundamentally different premises of these approaches render them irreconcilable with one another. In this paper, we present the first logical formalisation of these two paradigms.The more widely-accepted approach - which we label the demographic paradigm - includes both population ecology and community ecology (...) (synecology). Demographic ecology assumes that the environment is relatively stable and that biotic processes, governed predominantly by resource availability, are the most important of ecological and evolutionary influences. Moreover, ecological processes are assumed to translate into directional selection pressures that drive significant evolutionary change on a local scale through the process of optimisation. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Philosophy, Psychiatry, & Psychology 9.3 (2002) 265-269 [Access article in PDF] The Psychology and Physiology of Depression Walter Glannon Trauma and stressful events can disrupt the physiologic homeostasis of our bodies and brains. The physiologic stress response consists of neural and endocrine mechanisms whose function is to reestablish homeostasis. These mechanisms include the secretion of glucocorticoids (cortisol) and catecholemines (epinephrine and norepinephrine). Once an external event has ceased (...) to be a stressor or threat to a human organism, an integrated system of negative feedback loops inhibits the continued production of these hormones and effectively shuts down the stress response. These mechanisms are adaptive in the sense that they ensure the survival of the organism by reestablishing homeostasis. But prolonged exposure to real or perceived stressors can trigger prolonged secretion of stress hormones, thereby disrupting the feedback systems and causing a cascade of pathogenic events. The stress response is a double-edged sword. An acute stress response can protect an organism from external threats and reestablish homeostasis. But a chronic stress response can cause the body's defenses to become damaging rather than protective and to result in various disorders. Acute stress responses are adaptive. Chronic stress responses are often maladaptive and pathogenic.In "Depression as a Mind-Body Problem," I characterized major clinical depression as a disorder resulting from a maladaptive chronic stress response (Glannon 2003). Specifically, I argued that depression often results when our beliefs and emotions are out of proportion to the true nature of external events. The mind prolongs rather than constrains the physiologic stress response. Depression is not a disorder of the brain alone or the mind alone, however. Endocrine and immune dysfunction can contribute to the dysfunction in the brain and central nervous system that are involved in depression. Moreover, the contents of the mental states that initiate the sequence of events leading to depression are reflections of the person's natural and social environment. Thus, a satisfactory account of depression requires an analysis of the interconnections among the central nervous, endocrine, and immune systems, as well as the mind and the environment. All of these factors support the description of depression as a psychoneuroimmunologic disorder.Mike Martin (Martin 2003) and Thomas Fuchs (Fuchs 2003) discuss important aspects of depression that I did not elaborate in my paper. Martin argues that I fail to distinguish between depression as a mood and depression as a disorder. This is pertinent to the distinction evolutionary psychiatrists draw between moods that are adaptive and moods that are maladaptive. In contrast to my negative characterization of depression, Martin also makes a case for the positive [End Page 265] contributions of depression to meaningful life. Fuchs explores the notion of the brain as an organ of translation enabling patients to have meaningful subjective experience. The emphasis on subjectivity has important implications for potential preventive and therapeutic interventions for depression. For whether a person perceives an external event as a stressor may play a crucial role in the physiologic stress response. I will address the main points of these two authors in turn.Contrary to what Martin claims, I explicitly defined chronic depression as an affective (mood) disorder. My focus was on the clinical definition of major depression as a moderately severe to severe chronic disorder. It consists of affective, cognitive, and even physical dysfunction that interferes with a person's ability to carry out the normal tasks of daily life. This characterization of major chronic depression distinguishes it from milder forms of depression, such as dysthymia. Because these milder forms do not involve the same type or degree of dysfunction as more severe forms, they are not appropriately characterized as pathologies. For this reason, I focused on Nesse's (2000) discussion of depression rather than on his discussion of low mood. In fairness to Nesse and Stevens and Price (2000), not all forms of depression are pathologic according to the evolutionary view they defend. Some passive aspects of mild depression may be useful in alerting us to dangerous or wasteful behavior. It does seem plausible to describe depressed moods as falling along a continuum from those that... (shrink)

A plurality of philosophies has existed in the past and exists today. Perhaps the longer history that we have at our disposal now, together with the confluence of traditions and the need to think of philosophy in worldwide terms, has brought this plurality more to our attention than in the past, but in itself it is nothing new. What is new are the more sophisticated views of this plurality that have resulted from reflection upon it. We see that the holders (...) of different philosophies are able to defend them, that philosophies different from our own cannot be simply dismissed as false or meaningless, and that the plurality will not soon disappear. Who today would not view this plurality as a continuing feature of philosophic thought? (shrink)

One of six commentaries on “Obesity: Chasing an Elusive Epidemic,” by Daniel Callahan, from the January‐February 2013 issue.

Graphical AbstractHow exactly specific biological pathways and eventually life arise from the crowded molecular environment of the cell is a problem that has long vexed humanity and will require a paradigm shift toward mechanistic experimental and computational approaches that probe intracellular diversity and complexity more directly. More details can be found in article number 1800244 by Nils G. Walter. DOI: 10.1002/bies.201800244.

But he does not actually address any of those ideas. The surviving Poetics is incomplete. Until today. Here, Walter Watson offers a new interpretation of the lost second book of Aristotle's Poetics.

Summary A pupil of Köhler and von Hornbostel in Berlin, Arnheim published an article in the Musical Quarterly in 1984, where he applied the principles of visual composition to the musical form. In a painting, for example, the forces of visual composition are essential for aesthetic enjoyment; in music, sounds are essential as they are always occurring in time, and this constitutes the main dynamic vector of music. Starting with the tetrachord of ancient Greek music and analysing the relationships between (...) notes in the major and minor scales, Arnheim identifies what in the Western musical tradition represents the basis on which each note must relate: the tonal centre, the attractive motor that determines the perceptual dynamics of musical expression. Two examples, taken from Schubert and Béla Bartók, show us how the structure of the melodic construction is essential in generating different states of mind; Arnheim, however, does not stop at the simple eliciting of an emotion, but situates the musical structure in a more general framework, which refers to perceptual patterns belonging to any sphere, mental or physical, thanks to which we experience our reality. (shrink)

Current views of the control of complex, purposeful movements acknowledge that organizational processes must reconcile multiple concerns. The central priority is of course accomplishing the actor's goal. But in specifying the manner in which this occurs, the action plan must accommodate such factors as the interaction of mechanical forces associated with the motion of a multilinked system (classical mechanics) and, in many cases, intrinsic bias toward preferred movement patterns, characterized by so‐called “coordination dynamics.” The most familiar example of the latter (...) is the symmetry constraint, where spatial trajectories and/or temporal landmarks (e.g., reversal points) of concurrentlymoving body segments (limbs, digits, etc.) exhibit mutual attraction. The natural coordination tendencies that emerge through these constraints can facilitate or hinder motor control, depending on the degree of congruency with the desired movement pattern. Motor control theorists have long recognized the role of classical mechanics in theories of movement organization, but an appreciation of the importance of intrinsic interlimb bias has been gained only recently.Although detailed descriptions of temporal coordination dynamics have been provided, systematic attempts to identify additional salient dimensions of interlimb constraint have been lacking. We develop and implement here a novel method for examining this problem by exploiting two robust principles of psychomotor behavior, the symmetry constraint and the Two‐Thirds Power Law. Empirical evidence is provided that the relative spatial patterns of concurrently moving limbs are naturally constrained in much the same manner as previously identified temporal constraints and, further, that apparent velocity interference is an indirect, secondary consequence of primary spatial assimilation. The theoretical implications of spatial interference are elaborated with respect to movement organization and motor learning. The need to carefully consider the appropriate dimensions with which to characterize coordination dynamics is also discussed. (shrink)

Studies of coexistence are based ultimately on the assumption that competitive exclusion is a general and accredited phenomenon in nature. However, the ecological and evolutionary impact of interspecific competition is of questionable significance. Review of three reputed examples of competitive exclusion in the field (Aphytis wasps, red and grey squirrels, and triclads) demonstrates that the widely-accepted competition-based interpretations are unlikely, that alternative explanations are overlooked, and that all other reported cases need critical reinvestigation. Although interspecific competition does undoubtedly occur, the (...) evidence suggests it is usually too weak and intermittent a force to achieve competitive exclusion or any other ecologically-significant result, except perhaps rarely and on a minor scale. Coexistence and community structure are therefore not ecological conditions to be especially accounted for, especially since their inherently comparative methods generate information that is largely superficial. Alternative questions that relate directly to species, the units of diversity, are discussed and they emphasize the primary habitat requirements of species, which are fixed during speciation. Neither the comparative approach of coexistence studies, nor the investigation of pattern is likely to be profitable, since the acquisition of species-specific characteristics during speciation requires historical research. At least one alternative theory of ecology, based on the close adaptation of organisms to the environment, is available. (shrink)

Background: The American Medical Association, the British Medical Association and the Canadian Medical Association have guidelines that specifically discourage physicians from self-prescribing or prescribing to family members, but only the BMA addresses informal prescription requests between colleagues. Objective: To examine the practices of paediatric providers regarding self-prescribing, curbsiding colleagues, and prescribing and refusing to prescribe to friends and family. Methods: 1086 paediatricians listed from the American Academy of Paediatrics 2007 web-based directory were surveyed. Results: 44% of eligible survey respondents returned (...) usable surveys. Almost half of respondents had prescribed for themselves. An equal number had informally requested a prescription from a colleague. Three-quarters stated they had been asked to prescribe a prescription drug for a first-degree or second-degree relative, and 51% had been asked by their spouse. Eighty-six per cent stated that they had refused to write a prescription on at least one occasion for a friend or family member. The following reasons “strongly influenced” their decision to refuse a prescription request: outside of provider’s expertise ; patient’s need for his or her own physician ; not medically indicated ; need for a physical examination. Conclusion: These data confirm that most physicians have engaged in self-prescribing or curbside requests for prescriptions. It can be argued that curbsiding is more morally problematic than self-prescribing because it implicates a third party, and should be discouraged regardless of whether the requester is a colleague, family member or friend. (shrink)

Der Epiphänomenalismus ist eine Position in der Philosophie des Geistes, wonach mentale Ereignisse zwar vollständige physikalische Ursachen haben, selbst aber keine Ursachen oder Teilursachen anderer Ereignisse sind. Entgegen einer weit verbreiteten Meinung tritt die vorliegende Arbeit dafür ein, dass der Epiphänomenalismus keineswegs vollkommen absurd und unhaltbar ist. Es wird zunächst dafür argumentiert, dass er einige der gegen ihn üblicherweise erhobenen Einwände zwar sehr leicht entkräften kann, an anderen jedoch aus Gründen, die bislang kaum beachtet wurden, zu scheitern droht. Anschließend wird (...) eine Strategie diskutiert, mittels derer sich der Epiphänomenalismus unter bestimmten Bedingungen gegen einen Großteil der Einwände immunisieren kann; zugleich werden jedoch aber auch einige interne Schwierigkeiten angesprochen, die in diesem Zusammenhang zu Tage treten und den Epiphänomenalismus vor bislang in ihrer Tragweite nicht hinreichend erfasste Probleme stellen. Die Arbeit schließt mit einigen Spekulationen zu einer alternativen Variante des Epiphänomenalismus, die einen Teil dieser Probleme vermeiden kann. (shrink)

Many people still believe in life after death, but modern institutions operate as though this were the only world - eternity is now eclipsed from view in society and even in the church. This book carefully observes the eclipse - what caused it, how full is it, what are its consequences, will it last? How significant is recent interest in near-death experiences and reincarnation?

Current views of the control of complex, purposeful movements acknowledge that organizational processes must reconcile multiple concerns. The central priority is of course accomplishing the actor's goal. But in specifying the manner in which this occurs, the action plan must accommodate such factors as the interaction of mechanical forces associated with the motion of a multilinked system (classical mechanics) and, in many cases, intrinsic bias toward preferred movement patterns, characterized by so-called “coordination dynamics.” The most familiar example of the latter (...) is the symmetry constraint, where spatial trajectories and/or temporal landmarks (e.g., reversal points) of concurrentlymoving body segments (limbs, digits, etc.) exhibit mutual attraction. The natural coordination tendencies that emerge through these constraints can facilitate or hinder motor control, depending on the degree of congruency with the desired movement pattern. Motor control theorists have long recognized the role of classical mechanics in theories of movement organization, but an appreciation of the importance of intrinsic interlimb bias has been gained only recently.Although detailed descriptions of temporal coordination dynamics have been provided, systematic attempts to identify additional salient dimensions of interlimb constraint have been lacking. We develop and implement here a novel method for examining this problem by exploiting two robust principles of psychomotor behavior, the symmetry constraint and the Two-Thirds Power Law. Empirical evidence is provided that the relative spatial patterns of concurrently moving limbs are naturally constrained in much the same manner as previously identified temporal constraints and, further, that apparent velocity interference is an indirect, secondary consequence of primary spatial assimilation. The theoretical implications of spatial interference are elaborated with respect to movement organization and motor learning. The need to carefully consider the appropriate dimensions with which to characterize coordination dynamics is also discussed. (shrink)