Empathy is the combined ability to interpret the emotional states of others and experience resultant, related emotions. The relation between prefrontal electroencephalographic asymmetry and emotion in children is well known. The association between positive emotion (assessed via parent report), empathy (measured via observation), and second-by-second brain electrical activity (recorded during a pleasurable task) was investigated using a sample of one hundred twenty-eight 6- to 10-year-old children. Contentment related to increasing left frontopolar activation (p < .05). Empathic concern and positive (...) empathy related to increasing right frontopolar activation (ps < .05). A second form of positive empathy related to increasing left dorsolateral activation (p < .05). This suggests that positive affect and (negative and positive) empathy both relate to changes in prefrontal activity during a pleasurable task. (shrink)
In order to make an attempt at grouping the various aspects of brain functional imaging (fMRI, MRS, EEG-MEG, ...) within a coherent frame, we implemented a model consisting of a system of differential equations, that includes: (1) sodium membrane transport, (2) Na/K ATPase, (3) neuronal energy metabolism (i.e. glycolysis, buffering effect of phosphocreatine, and mitochondrial respiration), (4) blood-brain barrier exchanges and (5) brain hemodynamics, all the processes which are involved in the activation of brain areas. We assumed that the correlation (...) between brain activation and metabolism could be due to either changes in the concentrations of ATP and ADP following activation of Na/K ATPase that result from the changes in ion concentrations, or the involvement, in different phases of metabolism, of a second messenger such as calcium. In this article, we show how this type of model enables interpretation of MRS and fMRI published data that were obtained during prolonged stimulations. (shrink)
This study describes the results of experiments motivated by an attempt to understand spectral processing in the cerebral cortex (DeValois and DeValois, 1988; Pribram, 1971, 1991). This level of inquiry concerns processing within a restricted cortical area rather than that by which spatially separate circuits become synchronized during certain behavioral and experiential processes. We recorded neural responses for 55 locations in the somatosensory (barrel) cortex of the rat to various combinations of spatial frequency (texture) and temporal frequency stimulation of their (...) vibrissae. The recordings obtained from single and multi-unit bursts of spikes were mapped as surface distributions of local dendritic potentials. The distributions showed a variety of patterns that are asymmetric with respect to the spatial and temporal parameters of stimulation, and were, therefore, not simply reflecting whisker flick rate. Next, a simulation of our results showed that these surface distributions of local dendritic potentials can be described by Gabor-like functions much as in the visual system. The results provide support for a model of distributed cortical processing that imposes a physiologically derived frame (the limited extent of a dendritic patch) and an anatomically derived (axonal) sampling of the distributed process. This combination provides a complex Gabor wavelet that encodes phase, which is necessary to processing such details as edges and texture in a scene. The synchronization across cortical areas that make the Gabor wavelet processes within restricted cortical areas available to one another (the binding problem) proceed at a ''higher order'' level of integration. Both levels of distributed processing accomplish computation in the conjoint spacetime and spectral domain. (shrink)
This study describes the results of experiments motivated by an attempt to understand spectral processing in the cerebral cortex (DeValois and DeValois, 1988; Pribram, 1971, 1991). This level of inquiry concerns processing within a restricted cortical area rather than that by which spatially separate circuits become synchronized during certain behavioral and experiential processes. We recorded neural responses for 55 locations in the somatosensory (barrel) cortex of the rat to various combinations of spatial frequency (texture) and temporal frequency stimulation of their (...) vibrissae. The recordings obtained from single and multi-unit bursts of spikes were mapped as surface distributions of local dendritic potentials. The distributions showed a variety of patterns that are asymmetric with respect to the spatial and temporal parameters of stimulation, and were, therefore, not simply reflecting whisker flick rate. Next, a simulation of our results showed that these surface distributions of local dendritic potentials can be described by Gabor-like functions much as in the visual system. The results provide support for a model of distributed cortical processing that imposes a physiologically derived frame (the limited extent of a dendritic patch) and an anatomically derived (axonal) sampling of the distributed process. This combination provides a complex Gabor wavelet that encodes phase, which is necessary to processing such details as edges and texture in a scene. The synchronization across cortical areas that make the Gabor wavelet processes within restricted cortical areas available to one another (the binding problem) proceed at a ''higher order'' level of integration. Both levels of distributed processing accomplish computation in the conjoint spacetime and spectral domain. (shrink)
When words are read, the visual cortex is activated, independent of whether visual or motor associations are elicited. This word-evoked brain activity is significantly influenced by semantic meaning. Such effects occur very early after stimulus presentation (at latencies between 80 and 130 msec), indicating that semantic meaning activates different neuronal assemblies in the human visual cortex when words are processed.
It has been shown that visual awareness in the blind hemifield of hemianopic cats that have undergone unilateral ablations of visual cortex can be restored by sectioning the commissure of the superior colliculus or by destroying a portion of the substantia nigra contralateral to the cortical lesion (the Sprague effect). We propose that the visual awareness that is recovered is due to synchronized oscillatory activities in the superior colliculus ipsilateral to the cortical lesion. These oscillatory activities are normally partially suppressed (...) by the inhibitory, GABAergic contralateral nigrotectal projection, and the destruction of the substantia nigra, or the sectioning of the collicular commissure, disinhibits the collicular neurons, causing an increase in the extent of oscillatory activity and/or synchronization between activities at different sites. This increase in the oscillatory and synchronized character is sufficient for the activities to give rise to visual awareness. We argue that in rodents and lower vertebrates, normal visual awareness is partly due to synchronized oscillatory activities in the optic tectum and partly due to similar activities in visual cortex. It is only in carnivores and primates that visual awareness is wholly due to cortical activities. Based on von Baerian recapitulation theory, we propose that, even in humans, there is a period in early infancy when visual awareness is partially due to activities in the superior colliculus, but that this awareness gradually disappears as the nigrotectal projection matures. (shrink)
A venerable philosophical tradition holds that we rational creatures are distinguished by our capacity for a special sort of mental agency or self-determination: we can “make up” our minds about whether to accept a given proposition. But what sort of activity is this? Many contemporary philosophers accept a Process Theory of this activity, according to which a rational subject exercises her capacity for doxastic self-determination only on certain discrete occasions, when she goes through a process of consciously deliberating (...) about whether P and concludes by “making a judgment”, thereby bringing about a change in what she believes. I argue that this conception of our control over our beliefs implies an unacceptable picture of the agency we exercise in judging, and of the relation of such agency to the condition of belief itself. I suggest that the beliefs of a rational creature are themselves “acts of reason”, which reflect the capacity for doxastic self-determination in their very nature, not merely in certain facts about how they can originate. (shrink)
Currently, the widely used notion of activity is increasingly present in computer science. However, because this notion is used in specific contexts, it becomes vague. Here, the notion of activity is scrutinized in various contexts and, accordingly, put in perspective. It is discussed through four scientific disciplines: computer science, biology, economics, and epistemology. The definition of activity usually used in simulation is extended to new qualitative and quantitative definitions. In computer science, biology and economics disciplines, the new (...) simulation activity definition is first applied critically. Then, activity is discussed generally. In epistemology, activity is discussed, in a prospective way, as a possible framework in models of human beliefs and knowledge. (shrink)
Accounts of ontic explanation have often been devised so as to provide an understanding of mechanism and of causation. Ontic accounts differ quite radically in their ontologies, and one of the latest additions to this tradition proposed by Peter Machamer, Lindley Darden and Carl Craver reintroduces the concept of activity. In this paper I ask whether this influential and activity-based account of mechanisms is viable as an ontic account. I focus on polygenic scenarios—scenarios in which the causal truths (...) depend on more than one cause. The importance of polygenic causation was noticed early on by Mill (1893). It has since been shown to be a problem for both causal-law approaches to causation (Cartwright 1983) and accounts of causation cast in terms of capacities (Dupré 1993; Glennan 1997, pp. 605-626). However, whereas mechanistic accounts seem to be attractive precisely because they promise to handle complicated causal scenarios, polygenic causation needs to be examined more thoroughly in the emerging literature on activity-based mechanisms. The activity-based account proposed in Machamer et al. (2000, pp. 1-25) is problematic as an ontic account, I will argue. It seems necessary to ask, of any ontic account, how well it performs in causal situations where—at the explanandum level of mechanism—no activity occurs. In addition, it should be asked how well the activity-based account performs in situations where there are too few activities around to match the polygenic causal origin of the explanandum. The first situation presents an explanandum-problem and the second situation presents an explanans-problem—I will argue—both of which threaten activity-based frameworks. (shrink)
Skilled activity, such as shaving or dancing, differs in important ways from many of the stock examples that are employed by action theorists. Some critics of the causal theory of action contend that such a view founders on the problem of skilled activity. This paper examines how a causal theory can be extended to the case of skilled activity and defends the account from its critics.
Lately, a number of philosophers have argued that agents can be more and less active in the production of their own actions. Some actions—principally reflective, deliberative ones—are said to involve agential activity; other actions—principally unreflective, non-deliberative ones—are said to be brought about in a more passive fashion. In this essay, I critique these claims. I show that philosophers employing the notion of agential activity have relied on one or more of the following claims, which have not been clearly (...) distinguished in the literature: (1) that choice causes action, (2) that motives do not determine choice, and (3) that reflective deliberation suspends the effects of motives. These claims are closely related, and are often conflated in the literature. However, I argue that they are importantly distinct. I explicate and assess each of these claims, arguing that while there are precisifications of the first and second claims that render them true, there are philosophical arguments and results from empirical psychology indicating that the third claim is false. Moreover, I argue that the third claim is the crucial one; its truth is necessary in order to support the idea that reflective agency is paradigmatically active. As a result, the traditional accounts of agential activity must be rejected. I close by suggesting a new model of agential activity. (shrink)
This book addresses key topics in social theory such as the basic structures of social life, the character of human activity, and the nature of individuality. Drawing on the work of Wittgenstein, the author develops an account of social existence that argues that social practices are the fundamental phenomenon in social life. This approach offers new insight into the social formation of individuals, surpassing and critiquing the existing practice theories of Bourdieu, Giddens, Lyotard, and Oakeshott. In bringing Wittgenstein's work (...) to bear on issues of social theory the book shows the relevance of his work to a body of thought to which it has never been applied. The book will be of particular interest to philosophers of the social sciences, a wide range of social theorists in political science and sociology, as well as some literary theorists. (shrink)
There has been relatively little discussion, in contemporary philosophy of mind, of the active aspects of perceptual processes. This essay presents and offers some preliminary development of a view about what it is for an agent to watch a particular material object throughout a period of time. On this view, watching is a kind of perceptual activity distinguished by a distinctive epistemic role. The essay presents a puzzle about watching an object that arises through elementary reflection on the consequences (...) of two apparent truths about watching an object throughout a period of time. It proposes that the puzzle can be resolved by a view according to which for an agent to watch an object throughout a period of time is for that agent to maintain visual awareness of that object with the aim of perceptually knowing what that object is doing. The essay goes on to make some further suggestions about how the apparatus developed in connection with the notion of watching may enable us to offer related explanations of other kinds of perceptual activity. It proposes that a useful distinction can be drawn between perceptual activities like watching which have as their aim knowledge of what an object is doing and activities like looking or visually scrutinizing which have as their aims knowledge of the states or conditions of the objects of perceptual awareness. (shrink)
For Marx, work is the fundamental and central activity in human life and, potentially at least, a ful lling and liberating activity. Although this view is implicit throughout Marx’s work, there is little explicit explanation or defence of it. The fullest treatment is in the account of ‘estranged labour’ [entfremdete Arbeit] in the Economic and Philosophical Manuscripts;1 but, even there, Marx does not set out his philosophical assumptions at length. For an understanding of these, one must turn to (...) Hegel. Marx is quite explicit about his debt to Hegel in this respect. (shrink)
This essay analyzes the time of human activity. It begins by discussing how most accounts of action treat the time of action as succession, using Donald Davidson's account of action as illustration. It then argues that an adequate account of action and its determinants, one able to elucidate the ``indeterminacy of action,'' requires an alternative conception of action time. The remainder of the essay constructs a propitious account of the time and determination of action. It does so by critically (...) drawing on Henri Bergson's notion of duration and Martin Heidegger's notion of the teleological dimensionality (past, present, and future) of existence. Whereas Bergson provides valuable insights into the continuity of activity, Heidegger illuminates the determination of action. Combining their insights yields an account of the time of activity that supplements succession with a nonsuccessive temporality: the time of activity is an overlapping continuum of action performances each of which is structured as coming towards an end starting from a motivating state of affairs. The essay concludes with brief thoughts on what justifies calling the nonsuccessive dimensionality of existence a kind of time. (shrink)
In his discussion of pleasure, Aristotle assumes the thesis that a perfect activity always and necessarily yields pleasure. The occurrence of pleasure is even presented as a sign that the activity is perfect. But this assumption seems to be too easy. It is possible that we do feel pleasure in activities which are not perfectly performed, and on the other hand, it is not certain at all that I will enjoy a perfect activity. Pleasure falls into the (...) category of what J. Elster has called 'states that are essentially by-products'. Up to a point, Aristotle acknowledges this, but he does not follow this analysis to its final consequences. If one agrees, as Aristotle does, that there is a difference between the perfect activity and pleasure, it should be possible that an activity is perfect without yielding pleasure, or that pleasure will accompany even an activity which is not perfect. (shrink)
Since the publication of my "Are Theories of Imagery Theories of Imagination? An _Active Perception_ Approach to Conscious Mental Content," (Thomas, 1999 - henceforth abbreviated as ATOITOI on this page), a good deal of published material has appeared or has come to my attention that either provides additional support for the Perceptual Activity Theory PA theory) of mental imagery presented in ATOITOI, or that throws further doubt on the rival (picture and description) theories that are criticized there. Other relevant (...) evidence was not mentioned in ATOITOI because I lacked the space for a proper explanation of its relevance. I hope eventually to write and publish a new account of
PA
theory, that will make use of much of this material. In the meantime this page provides citations (and, where possible, links) to the "new" support, and discussion sections that briefly explain the relevance of the cited material. Quite apart from presenting new lines of supporting evidence and argument, I hope this page will help to clarify many aspects of. (shrink)
Arguing against the dominant developmental theories (e.g., Piaget, 1945; Vygotsky, 1978) stating that pretend play is limited to early childhood, we illustrate that pretend play is an adaptive human activity of adulthood as well as childhood. We advance this argument on three levels. First, we offer an analysis of why the discipline of developmental psychology in the Western world considered play only as an activity of childhood by neglecting to explore whether or how pretend play exists during adulthood. (...) Second, we discuss the similarities between adult improvisational theater and children’s pretend play in illustrating our thesis that pretend continues to exist during adulthood. In this discussion, we focus on similarities in the definitions, psychological origins, social functions, and developmental consequences of pretend play and adult improvisation. Finally, we end the article with educational implications of conceptualizing pretend play as a life-span activity and offer directions for future research. (shrink)
Abstract: This paper reflects on the political importance of the activity of thinking and suggests that Arendt's space of politics may not be limited to its traditional abode within the public realm. Beyond the public realm of politics, Arendt's defense of political action requires attention to the private as well. What has been overlooked amidst all the attention to Arendt's defense of the public realm of politics over and against the rise of the social is her equally strong insistence (...) upon a vibrant and secure private realm where active thinking is possible. Arendt's private realm is a space of solitude that is the necessary prerequisite for the activity of thinking. Indeed, it is solitude that nurtures and fosters thoughtfulness and thus prepares individuals for the possibility of political action. To create a meaningful politics amidst the loneliness of the modern world, Arendt suggests, requires solitude, which she sees as the cradle of thinking. (shrink)
Aristotle's conception of being is dynamic. He believes that a thing is most itself when engaged in its proper activities, governed by its nature. This paper explores this idea by focusing on Metaphysics , a text that continues the investigation of substantial being initiated inMetaphysics Z. Q.1 claims that there are two potentiality-actuality distinctions, one concerned with potentiality in the strict sense, which is involved in change, the other concerned with potentiality in another sense, which he says is more useful (...) for the present project. His present project is the investigation of substantial being, and the relevant potentiality is the potentiality for activity, the full manifestation of what a thing is. I explore Aristotle's two potentiality-actuality distinctions AND argue that the second distinction is modeled on the first, with one crucial modification. Whereas a change is brought about by something other than the object or by the object itself considered as other (as when a doctor cures himself), an activity is brought about byte object itself considered as itself. This single modification yields an important difference: whereas a change leads to a state other than the one an object was previously in, an activity maintains or develops what an object already is. (shrink)
This paper explores the concept of _sensorimotor activity_ that is central to the enactive model of visual perception developed in Alva Noë’s book, _Action in Perception_. The appeal to sensorimotor activity is, I shall argue, subject to a dilemma. On one interpretation, such activity presupposes representational states, and therefore is unable to aid us in the project of understanding how an organism is able to represent the world. On the other interpretation, sensorimotor activity fails to accommodate the (...) essential normativity of representational states, and is therefore also unable to aid us in the project of understanding representation. The solution, I argue, lies in a new conception of sensorimotor activity, according to which such activity is normative, but where this normativity is not inherited from prior representational states. (shrink)
The Timespace of Human Activity shows that a concept of activity timespace drawn from the work of Martin Heidegger Provides new insights into the nature of ...
In the latter part of this two-article sequence, the concept of emotion as reorganization of the organism-environment system is developed further in relation to consciousness, subjective experience and brain activity. It is argued that conscious emotions have their origin in reorganizational changes in primitive co-operative organizations, in which they get a more local character with the advent of personal consciousness and individuality, being expressed in conscious emotions. However, the conscious emotion is not confined to the individual only, but it (...) gets its content and the emotional quale in the social context, and in relation to the norms of the given culture. Emotion is fundamentally the process of ascription of meaning to the parts of the world which are relevant in the achievement of results of behavior. Although emotions may be studied as reorganizational processes in the organism-environment system with the help of physiological recordings and behavioral observations, it is argued — in contrast to the mainstream cognitive science — that emotions cannot be localized in the brain, although the brain is important in their generation as a part of the organism-environment system. It is suggested that the parts of the brain most closely related to emotional expression contain neurons subserving functional systems which are formed in early development, and which are therefore most intimately related to reorganizational processes in the organism-environment system. (shrink)
Despite its significance in neuroscience and computation, McCulloch and Pitts's celebrated 1943 paper has received little historical and philosophical attention. In 1943 there already existed a lively community of biophysicists doing mathematical work on neural networks. What was novel in McCulloch and Pitts's paper was their use of logic and computation to understand neural, and thus mental, activity. McCulloch and Pitts's contributions included (i) a formalism whose refinement and generalization led to the notion of finite automata (an important formalism (...) in computability theory), (ii) a technique that inspired the notion of logic design (a fundamental part of modern computer design), (iii) the first use of computation to address the mind–body problem, and (iv) the first modern computational theory of mind and brain. (shrink)
There is considerable appeal to the Aristotelian idea that taking pleasure in an activity is sometimes simply a matter of attending to it in such a way as to render it wholehearted. However, the proponents of this idea have not made adequately clear what kind of attention it is that can perform the surprising feat of transforming otherwise indifferent activities into pleasurable ones. I build upon Gilbert Ryle's suggestion that taking pleasure in an activity is tantamount to engaging (...) in the activity while fervently desiring to do it and it alone. More specifically, I draw upon insights into the sort of evaluative attention involved in having a desire to generate corollary insights into the sort of attention that makes activity pleasurable. My aim is to offer a compelling account of a certain class of pleasures, and to shed light on their relation to reasons. I argue that prospective pleasures in this class are not always reasons for action, and that even when they are reasons they have this status only derivatively, as vivid apprehensions of an independent realm of values. This does not mean that such pleasures are never good. They are good provided that they track real values, for then they constitute a proper savoring of one's activities and/or circumstances, and provide a valuable respite from the distractions and unwarranted doubts that so often leave us at odds with ourselves and alienated from our own doings. (shrink)
In Book One of the Nicomachean Ethics (EN),1 Aristotle seeks to identify the human good, which he also calls eudaimonia2 or happiness (I 4, 1095a14-20) and which he explains as that for the sake of which one should do everything one does (I 7, 1097a22-24 and 1097a25- b21). After introducing the idea (in chapters one through three) and surveying some received accounts of it (in chapters four through six), he seems to give his definition in the seventh chapter, where he (...) appeals to the human function and concludes that "the human good is activity of the [rational] soul in accordance with virtue, and if there are multiple virtues, in accordance with the best and most complete virtue" (I 7, 1098a16-18).3 This account is sketchy, as Aristotle admits (I 7, 1098a20-22): he needs to say what virtuous activity is, how many virtues there are, and whether some one virtue is best and most complete. But the account has enough content to suit Aristotle's initial purposes (I 7, 1098a22-b8) and to court interpretive controversy. Perhaps the most obvious controversy is this: Does Aristotle really mean that the human good is just virtuous rational activity? Are health and wealth, not to mention friends and lovers, not part of the goal for the sake of which one should do everything one does? Many readers think that Aristotle does not intend such a narrow account. Some point to what he says about happiness before he comes to the human function argument, or to what he says about the good.. (shrink)
An exploration is given of neural network features now being uncovered in cortical processing which begins to go a little way to help bridge the ''Explanatory Gap'' between phenomenal consciousness and correlated brain activity. A survey of properties suggested as being possessed by phenomenal consciousness leads to a set of criteria to be required of the correlated neural activity. Various neural styles of processing are reviewed and those fitting the criteria are selected for further analysis. One particular processing (...) style, in which semiautonomous and long-lasting cortical activity ''bubbles'' are created by input, is selected as being the most appropriate. Further experimental criteria are used to help narrow the possible neural styles involved. This leads to a class of neural models underpinning phenomenal consciousness and to a related set of testable predictions. (shrink)
How to draw the distinction between activity and passivity? Whatever that might be, the causal theory of action cannot give the right answer, as it offers an essentially passive account of human action.
Marcin Lewinski: Internet Political Discussion Forums as an Argumentative Activity Type. A Pragma-dialectical Analysis of Online Forms of Strategic Manoeuvring in Reacting Critically Content Type Journal Article Pages 255-259 DOI 10.1007/s10503-011-9201-3 Authors Paul van den Hoven, Utrecht University, Utrecht, The Netherlands Journal Argumentation Online ISSN 1572-8374 Print ISSN 0920-427X Journal Volume Volume 25 Journal Issue Volume 25, Number 2.
This paper argues that one's perception of another person's bodily activity is not the perception of the mere flexing and bending of that person's limbs, but rather of that person's intentions. It makes its case in three parts. First, it examines what conditions are necessary for children to begin to imitate and assimilate the behavior of other adults and argues that these conditions include the perception of intention. These conditions generalize to adult perception as well. Second, changing methodologies, the (...) paper presents a first person phenomenology of watching another person act which demonstrates that one's own perception is of intentions. The phenomenological analysis of time consciousness is the keystone of this argument. Finally, the paper looks at some recently established facts about infant and child development, and shows that these facts are best explained by thinking that the child is already perceiving intention. (shrink)
Many competing ideas exist around teaching ‘standard’ high school social studies subjects such as history, government, geography, and economics. The purpose of this paper is to explore the potential of social studies teaching and learning as a moral activity. I first propose that current high school curriculum standards in the United States often fail in focusing on the kinds of sustained discourse and ideas necessary for students to develop an awareness and commitment to justice in a pluralistic society. I (...) then make the argument that understanding social studies as an inherently moral activity creates a space for transformative and meaningful learning to occur. Lastly, I contend that public schools are inextricably linked to understanding and creating elements of a just society and as such, hold equal potential to both support and severely hinder its development. (shrink)
Comments on Sukjae Lee's "Berkeley on the Activity of Spirits," presented at Eastern Division Meeting of the American Philosophical Association, Baltimore, MD, December 2007.
Book description: This book contains groundbreaking contributions to the philosophical analysis of mathematical practice. Several philosophers of mathematics have recently called for an approach to philosophy of mathematics that pays more attention to mathematical practice. Questions concerning concept-formation, understanding, heuristics, changes in style of reasoning, the role of analogies and diagrams, etc. have become the subject of intense interest. The historians and philosophers in this book agree that there is more to understanding mathematics than a study of its logical structure. (...) How are mathematical objects and concepts generated? How does the process tie up with justification? What role do visual images and diagrams play in mathematical activity? What are the different epistemic virtues (explanatoriness, understanding, visualizability, etc.) which are pursued and cherished by mathematicians in their work? The reader will find here systematic philosophical analyses as well as a wealth of philosophically informed case studies ranging from Babylonian, Greek, and Chinese mathematics to nineteenth century real and complex analysis. (shrink)
This paper develops Lewis’ notion of convention within a framework that mixes cognitive science with some more social theories of activity like distributed cognition and activity theory. The close examination of everyday situations of convention-based activity will produce some interesting issues for a cognitive theory of behavior. Uncertainty, dynamics, and the complexities of the performance of convention-based activities that are distributed over time and/or place, are driving factors in the analysis that is presented. How the actors reason (...) and manage their collaboration is characterized as pragmatic action. During the course of recurrent activities, the participants adapt previously learned convention-based activities to new circumstances. The coordinating representations that are a part of the design of the context mediate parts of the activity. As they act, the participants learn. (shrink)
This article explores the ethical implications of the goal of functional independence for persons with disabilities. Central to independence is protection against the fear and uncertainty of future dependency and assurance of a level of social status. Moreover, independence reflects individualism, autonomy and control of decisions about one's life. Dependency, in contrast, implies the inability to do things for oneself and reliance on others to assist with tasks of everyday life. The ethics of independence are explored within the context of (...) the medical and social constructionist models of disability and contrasted against the ethics of support that underscores self-regulated dependency. Self-regulated dependency gives emphasis to the need for support created through relationships, choices and the management of resources. Finally, the article concludes with a challenge to meaningfully translate the principles of ethics to the multiplicity of adapted physical activity contexts. (shrink)
There are strong resemblances between the neurobiological characteristics of hallucinations occurring in the particular case of schizophrenia and the hallucinatory activity observed during the rapid-eye-movement (dreaming) sleep stage: the same prefrontal dorsolateral deactivation; forebrain disconnectivity and disinhibition; sensory deprivation; and acetylcholine, monoamine, and glutamate modifications.
We consider how to discern whether or not evolution is taking place in an observed system. Evolution will be characterized in terms of a particular macroscopic behavior that emerges from microscopic organismic interaction. We de ne evolutionary activity as the rate at which useful genetic innovations are absorbed into the population. After measuring evolutionary activity in a simple model biosphere, we discuss applications to other systems. We argue that evolutionary activity provides an objective, quantitative interpretation of the (...) intuitive idea of biological teleology. We also propose using evolutionary activity in a test for life. (shrink)
Polygenic effects have more than one cause. They testify to the fact that several causal contributors are sometimes simultaneously involved in causation. The importance of polygenic causation was noticed early on by Mill (1893). It has since been shown to be a problem for causal-law approaches to causation and accounts of causation cast in terms of capacities. However, polygenic causation needs to be examined more thoroughly in the emerging literature on causal mechanisms. In this paper I examine whether an influential (...) theory of mechanisms proposed by Peter Machamer, Lindley Darden and Carl Craver can accommodate polygenic effects and other forms of causal interaction. This theory is problematic, I will argue, because it ascribes a central role to activities. In it, activities are needed not only to constitute mechanisms but also to perform the causal role of mechanisms. Any such mechanism-as-activity will be incompatible with causal situations where either no or merely another kind of activity occurs. But, as I will try to illustrate in this paper, both kinds of situation may be frequent. If I am right, the view that Machamer and colleagues suggest leads to an impoverished conception of mechanism. (shrink)
Deep appreciation of the relevance of emotion to epistemology requires a rich account of how emotional mental states such as happiness, sadness and desire interact with cognitive states such as belief and doubt. Analytic philosophy since Gottlob Frege and Bertrand Russell has assumed that such mental states are propositional attitudes, which are relations between a self and a proposition, an abstract entity constituting the meaning of a sentence. This chapter shows the explanatory defects of the doctrine of propositional attitudes, and (...) proposes instead that beliefs, desires, and emotions should be construed naturalistically using current understanding of brain mechanisms. Mental states are patterns of neural activity, not relations between dubious entities such as selves and propositions. From this perspective, it becomes easy to see how cognition and emotion are intertwined, and hence how emotions can be integral to epistemology. I begin by reviewing some of the ways in which emotions are relevant to epistemology: as frequent contributors to the growth of knowledge, as sometime impediments to knowledge acquisition, and as components of knowledge about persons and morality. I then argue that propositional attitudes do not exist, because the selves and the propositions that they purportedly relate do not exist. Thus the doctrine of propositional attitudes is as useless for epistemology as it is for explaining human action. I argue for an alternative construal of mental states as patterns of neural activity, and July 23, 2007 describe how it is possible to give a theoretically rich and empirically supported account of the neurophysiological interconnections of cognition and emotion. Finally, I discuss the epistemological significance of this naturalistic, materialist reconstrual of cognitions and emotions. (shrink)
This essay argues that the practice ofmedicine is not a phronetic activity in theoriginal Aristotelian sense of that term. Jonsen andToulmin are two philosophers who have conflated thetechne of medicine with phronesis. Thisconflation ignores Aristotle's crucial distinctionbetween techne and phronesis and his useof the medical analogy. It is argued that medicalreasoning is similar to phronesis but does notexemplify it. Phronesis will not save thelife of medical ethics. The concept could be utilized as amoral prosthetic.
This paper propounds a new reading of Berkeley's account of the activity of finite spirits. Against existing interpretations, the paper argues that Berkeley does not hold that we causally contribute to the movement of our bodies. In contrast, our volitions to move our bodies are but occasions for God to cause their movement. In answer to the question of wherein then consists our activity, the paper proposes that our activity consists in the dual powers to produce (1) (...) our volitions ? the acts of willing ? and (2) our ideas of imagination. (shrink)
The paper examines Lévi-Strauss' criticisms of Sartre's conception of dialectical reason and history as presented in the last chapter of La Pensée Sauvage , suggesting that these criticisms are misplaced. Sartre's notion of reason and history in the Critique is much closer to structuralist accounts than Lévi-Strauss seems to recognize, but it differs in placing a strong emphasis on activity and praxis in place of the latter's passive conception of reason. The active role of the inquirer in structuralist thought (...) is examined using Roland Barthes' account of "The Structuralist Activity," which is shown to have important affinities with Sartre's own conception of the relation of structure and praxis in the Critique . I then briefly consider a modified conception of the role of history in structuralism expressed by Lévi-Strauss in the mid-seventies, suggesting that his altered position still fails to recognize the important role of praxis in structuralist accounts of history. I conclude by suggesting that Lévi-Strauss' criticisms are nonetheless important for illustrating the "Critical" character of Sartre's Critique. (shrink)
Can we conceive of a philosophy of technology that is not technophobic, yet takes seriously the problem of alienation and human meaning-giving? This paperretrieves the concern with alienation, but brings it into dialogue with more recent philosophy of technology. It defines and responds to the problem of alienation in a way that avoids both old-style human-centered approaches and contemporary thingcentered or hybridity approaches. In contrast to the latter, it proposes to reconcile subject and object not at the ontic level but (...) at the ontological, transcendental level and at the level of skilled activity. Taking inspiration from Dreyfus’s reading of Heidegger and engaging critically with the work of Borgmann and Arendt, it explores a phenomenology and ethics of skill. It is concluded that new and emerging technologies must be evaluated not only as artifacts and their consequences, but also in terms of the skills and activities they involve and require. Do they promote engagement with the world and with others, thus making us into better persons? (shrink)
Consciousness is seen as a difficult “binding” problem. Binding, a process where different sensations evoked by an item are associated in the nervous system, can be viewed as a process similar to associative learning. Several reports that consciousness is associated with some form of memory imply that different forms of memories have a common feature contributing to consciousness. Based on a proposed synaptic mechanism capable of explaining different forms of memory, we developed a framework for consciousness. It is based on (...) the formation of semblance of sensory stimulus from (1) synaptic semblances when excitatory postsynaptic potentials arrive at functionally LINKed postsynaptic membranes, and (2) network semblances when these potentials summate to elicit action potential initiating activity in a network of neurons. It is then possible to derive a framework for consciousness as a multi-dimensional semblance. According to this framework, a continuum of semblances formed from background sensory stimuli and oscillating neuronal activities serve to maintain consciousness. Feasibility of this framework to explain various physiological and pathological states of consciousness, its subjective nature and qualia is examined. (shrink)
In The Retrieval of Ethics, Talbot Brewer defends an Aristotelian-inspired understanding of the good life, in which living the good life is conceived of in terms of engaging in a unified dialectical activity. In this essay, I explore the assumptions at work in Brewer's understanding of dialectical activity and raise some concerns about whether or not we have reason to embrace them. I argue that his conception of human nature and that towards which we are drawn stands in (...) tension with empirical research on motivation. Given this tension, I conclude that it is implausible to construe living the good life as a unified dialectical activity. (shrink)
This paper identifies the ultimate justification for business activity as an aesthetic justification. Aesthetics, loosely defined as the appreciation of beauty, subsumes both ethics and economics within an holistic justificatory mechanism for business decisions. Five essential qualities of aesthetic judgment are identified: disinterest, subjectivity, inclusivity, contemplativity, and internality. The quality of aesthetic judgment, exercised by the individual through the organization, will determine the extent to which business activity enhances quality of life.
Soltis' paper contains little data on the underlying neural substrate of the discussed signal function of early infant crying – probably because there is amazingly little known about it. We here discuss the interest of functional neuroimaging as an objective measurement of brain activity in (1) early infants during crying and (2) parents hearing their offspring cry.
The Periodic Table has the column of the noble gas atoms (He, Ne, Ar, Kr, Xe, Rn) as one of its main pillars. Indeed the inert chemical nature of their closed shell structure is so striking that it is sometimes extended to all such structures. Is it true however that any closed shell, say a closed d-subshell will denote a lack of chemical activity? Take the noble metals for instance, so renowned for their catalytic capacity. Platinum has 10 electrons (...) in its valence shell which makes one of its excited states to be a closed 5d10–6s0 state. Surely this state would not be expected to be crucial to the catalytic activity of platinum, or would it? Or take palladium whose ground state is precisely the 4d10–5s0 state, should we expect that an isolated Pd atom at near zero-point temperature would attack a closed-shell hydrogen molecule efficiently? We shall here show that this is precisely the case; the closed-shell excited states of nickel and platinum are indeed crucial, through symmetry avoided crossings, for their reactivity. Other valuable catalysts as ruthenium depend on their excited states with maximal d-shell occupancy for their activity. The most notable confirmation of this new finding; that closed d-shells are vital to the catalytic activity of noble metals however, is the case of palladium whose closed-shell ground state is indeed capable of attacking hydrogen and hydrocarbon molecules even at temperatures well below 10 K as was predicted theoretically and immediately confirmed experimentally. (shrink)
This paper discusses some of the ethical aspects in research in Adapted Physical Activity (APA). It indicates some of the ethical challenges related to the choice of research problem to be investigated, and the treatment of participants, not least when working with people who are in some ways in a more vulnerable life situation. Drawing also on experiences as a researcher with a disability, the challenges and potential benefits of involving people with disabilities in APA research is critically discussed.
Drawing on a dialogical approach to skill that highlights the social, contextually situated creative and responsive nature of skilled activity and narrative and non-narrative features, this article focuses on the non-narrative or argumentative aspects of skill and skilled activity. In particular, it looks at how the argumentative aspects of skill play a crucial role in a key task in skilled activity. The creation of a visible sense of social and moral order from the ambiguity and vagueness that (...) exist in any one context is a necessary move from uncertainty to certainty. This article provides a detailed examination of a negotiation between two managers. It concludes by drawing out implications for organizational practice. (shrink)
Background: Hypothalamic-pituitary-adrenal (HPA) system activation is adaptive in response to stress, and HPA dysregulation occurs in stress-related psychopathology. It is important to understand the mechanisms that modulate HPA output, yet few studies have addressed the neural circuitry associated with HPA regulation in primates and humans. Using high-resolution F-18-fluorodeoxyglucose positron emission tomography (FDG-PET) in rhesus monkeys, we assessed the relation between individual differences in brain activity and HPA function across multiple contexts that varied in stressfulness.
We examine the notion of inquiry and argue that philosophic inquiry is a transcendental activity. Activities, viewed as conforming to intelligible canons, applying to appropriate contexts, and directed to specifiable ends, are contrasted with their empirical descriptions. Inquiry, characterized as an internalized, continuous activity directed to an intrinsic end, and fundamentally presupposed by other activities, is considered at the levels of (1) science, (2) philosophy and (3) transcendental philosophy. We argue that (2) is a transcendental activity which (...) determines non?empirical concepts and is presupposed by (1). Alternative philosophic frameworks are grounded on hypothetical canons conceived by intelligence itself, which imply interpretations of objectivity and universality claiming validity for the community of inquirers, but they can always be rejected. We consider the possibility of categorical canons operating as second?order rules necessarily presupposed for the formulation of alternative philosophic frameworks, and (3) would be the activity of identifying, justifying and applying such transcendental canons of inquiry in general. Finally, we suggest that the only possible ?justification? of such categorical canons would be a kind of ontological proof. Thus, a given philosophic approach reflects the transcendental activity of determining non?empirical concepts through the implementation of its fundamental regulative norms; but transcendental philosophy would determine the concept of philosophy itself through implementation of the categorical canons of inquiry in the construction of philosophic systems. (shrink)
This article focuses on ethical concerns about modifying physical activities within a variety of education, recreation, rehabilitation and competition contexts. An ecological frame of reference common within current educational and rehabilitation theories is utilised for reflecting upon adapted physical activity practices. Ethical principles challenged in the article are (a) the utilitarian consequence to all participants; (b) professional paternalism; and (c) empowerment of individuals with a disability. Concerns arising with respect to these ethical principles in adapted physical activity practices (...) are discussed across modifications in terms of (i) the tasks involved; (ii) the environmental conditions; (iii) the equipment used; (iv) the game rules; and (v) the instruction methods. (shrink)
In the formation of the multi-disciplinary field that investigates the participation of disabled persons in all forms of physical activity, little ethical and philosophical work has been published. This essay serves to contextualise a range of issues emanating from adapted physical activity (APA) and disability sports. First, we offer some general historical and philosophical remarks about the field which serve to situate those issues at the crossroads between the philosophy of disability and the philosophy of sports. Secondly, we (...) bring brief but critical attention to the contestation of key concepts such as ?ability? and ?normality? and the recent criticisms of polarisation of the medical and social models of disability. Finally, we show how these conceptual issues are implicated in the whole spectrum of contexts of APA and disability sports from the ethics of research with and for the disabled, to coaching, rehabilitation and teaching, and sports administration, that are predicated on key ethical concepts including empathy, entitlement and equity. (shrink)
Although activity aimed at the construction of artificial intelligence started about 60 years ago however, contemporary intelligent systems are effective in very narrow domains only. One of the reasons for this situation appears to be serious problems in the theory of intelligence. Intelligence is a characteristic of goal-directed systems and two classes of goal-directed systems can be derived from observations on animals and humans, one class is systems with innately and jointly determined goals and means. The other class contains (...) systems that are able to construct arbitrary goals and means. It is suggested that the classes (that implicitly underlie most models of artificial intelligence) are insufficient to explain human goal-directed activity. A broader approach to goal-directed systems is considered. This approach suggests that humans are goal-directed systems that jointly synthesize arbitrary goals and means. Neural and psychological data favoring this hypothesis and its experimental validation are considered. A simple computer model based on the idea of joint synthesis to simulate goal-directed activity is presented. The usage of the idea of joint synthesis for the construction of artificial intelligence is discussed. (shrink)
The target articles on sleep and dreaming are discussed in terms of the concept of search activity integrating different types of behavior, body resistance, REM sleep/dream functions, and the brain catecholamine system. REM sleep may be functionally sufficient or insufficient, depending on the dream scenario, the latter being more important than the physiological manifestation of REM sleep. REM sleep contributes to memory consolidation in the indirect way. [Nielsen; Revonsuo; Solms; Vertes & Eastman].
Does the level of marketing activity in a country contribute to societal well-being or quality of life? Does economic efficiency also play a positive role in societal well-being? Does economic efficiency also moderate or mediate the marketing activity effect on societal well-being? Marketing activity refers to the pervasiveness of promotion expenditures and number of retail outlets per capita in a country. Economic efficiency refers to the extent to which the economy is unhampered by corruption, burdensome government regulation, (...) and a large informal economy. We used secondary data from the World Bank and other statistical sources to answer these questions. Our study findings suggest that both marketing activity and economic efficiency contribute positively to societal well-being, and that economic efficiency plays more of a mediator than moderator role between marketing activity and societal well-being. The public policy implication of this study is that increases in marketing activity and economic efficiency in countries characterized as low on both dimensions should significantly increase the quality of life in those countries. (shrink)
The gendered subcultures of our society may have different value systems. Consequently, sexual activity that involves members of these subcultures may be problematic, especially concerning the encoding and decoding of consent. This has serious consequences for labelling the activity as sex or sexual assault. Conceiving consent not as a mental act but as a behavioural act (that is, using a performative standard) would eliminate these problems. However, if we remove the mental element from one aspect, then to be (...) consistent we must remove it from all; and, as a result, the “mistaken belief” defense would be eliminated and mens rea would become insignificant (in other words, if what the woman means is irrelevant, then what the man believes or intends should also be irrelevant). This consequence suggests major changes to our current conceptions of legal justice, which changes, if undesirable, prompt reconsideration of the initial proposal to use a performative standard for consent. (shrink)
Among the foundations of the sciences and the humanities should be counted the norms and values which they necessarily presuppose. This argument requires us to view science and scholarship (systematic cognitive activity) as deliberate and complex forms of human activity . Human action can be ('rationally') guided and legitimated only by reference to norms and values. It is shown that, historically, there are at least three distinct traditions: (1) The Platonic-Aristotelian, (2) the Baconian, and (3) the Weberian. The (...) first is based on the value of 'self-realization'; the second on welfare as a function of technological control; and the third on the justification of science through the Wertfreiheit of its practitioners. It is then argued that when we add (4), a set of general methodological norms, and (5), the ideal of academic freedom or autonomy, we have before us an 'ideology of cognitive activity' which it is now important to study, historically, critically, and constructively. For some such ideology is as indispensable as internal and external demands for legitimation (of science, etc.) are now both inescapable and justified. (shrink)
Using the concepts of chaotic dynamical systems, we present an interpretation of dynamic neural activity found in cortical and subcortical areas. The discovery of chaotic itinerancy in high-dimensional dynamical systems with and without a noise term has motivated a new interpretation of this dynamic neural activity, cast in terms of the high-dimensional transitory dynamics among “exotic” attractors. This interpretation is quite different from the conventional one, cast in terms of simple behavior on low-dimensional attractors. Skarda and Freeman (1987) (...) presented evidence in support of the conclusion that animals cannot memorize odor without chaotic activity of neuron populations. Following their work, we study the role of chaotic dynamics in biological information processing, perception, and memory. We propose a new coding scheme of information in chaos-driven contracting systems we refer to as Cantor coding. Since these systems are found in the hippocampal formation and also in the olfactory system, the proposed coding scheme should be of biological significance. Based on these intensive studies, a hypothesis regarding the formation of episodic memory is given. Key Words: Cantor coding; chaotic itinerancy; dynamic aspects of the brain; dynamic associative memory; episodic memory; high-dimensional dynamical systems; SCND attractors. (shrink)
Over the past decade there has been a trend within adapted physical activity (APA) to question the hegemony of the medical understanding of disability. This debate has consequences for professional practice, which some argue should be regarded as a learning situation with a pedagogical orientation. The concept of evidence-based practice and research has spread from its origin in medicine to other allied health fields and education. In this article I discuss the limitations of applying evidence-based practice to a pedagogical (...) approach to APA. More specifically, I use the Aristotelian notion phronesis to show that professional practice of APA is essentially characterized by an indeterminacy that cannot be eradicated through the technological thinking inherent in evidence-based practice. (shrink)
Gliomas can display marked changes in the concentrations of energy metabolism molecules such as creatine (Cr), phosphocreatine (PCr) and lactate, as measured using magnetic resonance spectroscopy (MRS). Moreover, the BOLD (blood oxygen level dependent) contrast enhancement in functional magnetic resonance imaging (fMRI) can be reduced or missing within or near gliomas, while neural activity is not significantly reduced (so-called neurovascular decoupling), so that the location of functionally eloquent areas using fMRI can be erroneous. In this paper, we adapt a (...) previously developed model of the coupling between neural activation, energy metabolism and hemodynamics, by including the venous dilatation Balloon model of Buxton and Frank. We show that decreasing the cerebral blood flow (CBF) baseline value, or the CBF increase fraction, results in a decrease of the BOLD signal and an increase of the lactate peak during a sustained activation. Baseline lactate and PCr levels are not significantly affected by CBF baseline reduction, but are altered even by a moderate decrease of mitochondrial respiration. Decreasing the total Cr and PCr concentration reduces the BOLD signal after the initial overshoot. In conclusion, we suggest that the coupled use of BOLD fMRI and MRS could contribute to a better understanding of the neurovascular and metabolic decoupling in gliomas. (shrink)
In this paper we propose a theoretical model of protein folding and protein evolution in which a polypeptide (sequence/structure) is assumed to behave as a Maxwell Demon or Information Gathering and Using System (IGUS) that performs measurements aiming at the construction of the native structure. Our model proposes that a physical meaning to Shannon information (H) and Chaitin's algorithmic information (K) parameters can be both defined and referred from the IGUS standpoint. Our hypothesis accounts for the interdependence of protein folding (...) and protein evolution through mutual influencing relationships mediated by the IGUS. In brief, IGUS activity in protein folding determines long term tendencies that emerge at the evolutionary time-scale.Thus, protein evolution is a consequence of measurements executed by proteins at the cellular level, where the IGUS imposes a tendency to attain a highly unique stable native form that promotes the updating of the information content. The folding kinetics observed is, thus, the outcome of an evolutionary process where the polypeptide-IGUS drives the evolution of its linear sequence. Finally, we describe protein evolution as an entropic process that tends to increase the content of mutual algorithmic information between the sequence and the structure. This model enables one: 1. To comprehend that full determination of the three-dimensional structure by the linear sequence is a tendency where satisfaction is only possible at thermodynamic equilibrium .2. To account for the observed randomness of the amino acid sequences. 3. To predict an alternation of periods of selection and neutral diffusion during protein evolutionary time. (shrink)
Synchronization of neural activity in oscillatory neural networks is a general principle of information processing in the brain at both preattentional and attentional levels. This is confirmed by a model of attention based on an oscillatory neural network with a central element and models of feature binding and working memory based on multi-frequency oscillations.
In this chapter, we aimed at further characterizing the functional neuroanatomy of the human rapid eye movement (REM) sleep at the population level. We carried out a meta-analysis of a large dataset of positron emission tomography (PET) scans acquired during wakefulness, slow wave sleep and REM sleep, and focused especially on the brain areas in which the activity diminishes during REM sleep. Results show that quiescent regions are confined to the inferior and middle frontal cortex and to the inferior (...) parietal lobule. Providing a plausible explanation for some of the features of dream reports, these findings may help in refining the concepts, which try to account for human cognition during REM sleep. In particular, we discuss the significance of these results to explain the alteration in executive processes, episodic memory retrieval and self representation during REM sleep dreaming as well as the incorporation of external stimuli into the dream narrative. (shrink)
Behrendt & Young (B&Y) suggest that hallucinations occur as a result of decoupling of neuronal populations from sensory control. I propose that such a decoupling is in fact a constant feature of brain activity, even under nonpathological conditions. This position is justified by evidence from recent neurophysiological recording studies. I suggest that hallucinations arise because of a breakdown in segregation of internally and externally generated activity in a neuronal population.
In the early twentieth century psychology became the study of "behavior." This article reviews developments within animal psychology, functional psychology, and American society and culture that help explain how a term rarely used in the first years of the century became not only an accepted scientific concept but even, for many, an all-encompassing label for the entire subject matter of the discipline. The subsequent conceptual and linguistic activity of John B. Watson, Edward C. Tolman, Clark L. Hull, and B.F. (...) Skinner, as they attempted to explain "behavior" throughout the course of the twentieth century, is then discussed. Finally, the article suggests the need for greater conceptual and linguistic diversity in psychology. In this last regard, reference is made to cognition and consciousness, to William James and John Dewey, and to the fact that prediction and control might not be the most relevant aims of contemporary psychology. (shrink)
Since theistic faith involves the notion of God as personally agential and since it faces difficulties in establishing its credibility in view both of problems in warrantably ascribing natural, historical and personal states to divine activity and of the counterevidence of evil, this paper takes up the story of a quadriplegic patient and certain remarks by Whitehead and Hartshorne to explore the viability of a concept of divine activity that is non-coercive but significant. In order to develop this (...) concept of God's agency and to warrant its credibility, the essential kenoticism of the divine is also discussed. (shrink)
Activity anorexia illustrates selection of behavior at the biological, behavioral, and neural levels. Based on evolutionary history, food depletion increases the reinforcement value of physical activity that, in turn, decreases the reinforcement effectiveness of eating – resulting in activity anorexia. Neural opiates participate in the selection of physical activity during periods of food depletion.
Many tensions exist within the nexus of corporate social responsibility, competitive strategy, and political activity. Previously, these aspects of strategic management have been considered in relative isolation or at best in pairs. Accordingly, an attempt is made here to set out a general strategic problem of the corporation, in which all three aspects are combined. This project reveals a particular need to explicate the political assumptions held by or on behalf of the corporation. Examples might include the classical liberal (...) model, global hypercompetition, or variants of the stakeholder model. The project also reinforces the broader notion that when one adopts the perspective of a corporate strategist, one can sometimes find potentially productive ways of reframing issues in ethics, economics, and politics. (shrink)
We study the influence of the individual behaviour of animals on predator-prey models. Populations of preys and predators are divided into sub-populations corresponding to different activity classes. The animals are assumed to do many activities all day long such as searching for food of different types. The preys are more vulnerable when doing some activities during which they are very exposed to predators attacks rather than for others during which they are hidden. We study activity sequences of the (...) animals and also the effect of a change in the average individual behaviour of the animals on Lotka-Volterra prey-predator interactions. Numerical simulations are realized for the whole sets of equations (governing the subpopulations) and are compared to the simulations of the reduced sets of equation (governing the populations). We look for the validity of the method with respect to a scaling factor which measures the differences between the two time scales associated to the fast-varying variables and to the slow-time varying global variables. It is shown that when the two time scales differ of about two orders of magnitude, the approximation is satisfying. (shrink)
We studied the patient JP who has exceptional abilities to draw complex geometrical images by hand and a form of acquired synesthesia for mathematical formulas and objects, which he perceives as geometrical figures. JP sees all smooth curvatures as discrete lines, similarly regardless of scale. We carried out two preliminary investigations to establish the perceptual nature of synesthetic experience and to investigate the neural basis of this phenomenon. In a functional magnetic resonance imaging (fMRI) study, image-inducing formulas produced larger fMRI (...) responses than non-image inducing formulas in the left temporal, parietal and frontal lobes. Thus our main finding is that the activation associated with his experience of complex geometrical images emerging from mathematical formulas is restricted to the left hemisphere. (shrink)
Early theorists (Freud and Darwin) speculated that extremely shy children, or those with anxious temperament, were likely to have anxiety problems as adults. More recent studies demonstrate that these children have heightened responses to potentially threatening situations reacting with intense defensive responses that are characterized by behavioral inhibition (BI) (inhibited motor behavior and decreased vocalizations) and physiological arousal. Confirming the earlier impressions, data now demonstrate that children with this disposition are at increased risk to develop anxiety, depression, and comorbid substance (...) abuse. Additional key features of anxious temperament are that it appears at a young age, it is a stable characteristic of individuals, and even in non-threatening environments it is associated with increased psychic anxiety and somatic tension. To understand the neural underpinnings of anxious temperament, we performed imaging studies with 18- fluoro-deoxyglucose (FDG) high-resolution Positron Emission Tomography (PET) in young rhesus monkeys. Rhesus monkeys were used because they provide a well validated model of anxious temperament for studies that cannot be performed in human children. Imaging the same animal in stressful and secure contexts, we examined the relation between regional metabolic brain activity and a trait-like measure of anxious temperament that encompasses measures of BI and pituitaryadrenal reactivity. Regardless of context, results demonstrated a trait-like pattern of brain activity (amygdala, bed nucleus of stria terminalis, hippocampus, and periaqueductal gray) that is predictive of individual phenotypic differences. Importantly, individuals with extreme anxious temperament also displayed increased activity of this circuit when assessed in the security of their home environment. These findings suggest that increased activity of this circuit early in life mediates the childhood temperamental risk to develop anxiety and depression.. (shrink)
