We all know what a voluntary action is - we all think we know when an action is voluntary, and when it is not. Yet, performing and action and defining it are different matters. What counts as an action? When does it begin? Does the conscious desire to perform an action always precede the act? If not, is it really a voluntary action? This is a debate that crosses the boundaries of Philosophy, Neuroscience, Psychology, and Social Science. This book brings (...) together some to the leading thinkers from these disciplines to consider this deep and often puzzling topic. The result is a fascinating and stimulating debate that will challenge our fundamental assumptions about our sense of free-will. (shrink)

In recent years, there has been much focus on the apparent heterogeneity of schizophrenic symptoms. By contrast, this article proposes a unifying account emphasizing basic abnormalities of consciousness that underlie and also antecede a disparate assortment of signs and symptoms. Schizophrenia, we argue, is fundamentally a self-disorder or ipseity disturbance that is characterized by complementary distortions of the act of awareness: hyperreflexivity and diminished self-affection. Hyperreflexivity refers to forms of exaggerated self-consciousness in which aspects of oneself are experienced as akin (...) to external objects. Diminished self-affection or self-presence refers to a weakened sense of existing as a vital and self-coinciding source of awareness and action. This article integrates recent psychiatric research and European phenomenological psychiatry with some current work in cognitive science and phenomenological philosophy. After introducing the phenomenological approach along with a theoretical account of normal consciousness and self-awareness, we turn to a variety of schizophrenic syndromes. We examine positive, then negative, and finally disorganization symptoms—attempting in each case to illuminate shared distortions of consciousness and the sense of self. We conclude by discussing the possible relevance of this approach for identifying early schizophrenic symptoms. (shrink)

The control of action has traditionally been described as "automatic". In particular, movement control may occur without conscious awareness, in contrast to normal visual perception. Studies on rapid visuomotor adjustment of reaching movements following a target shift have played a large part in introducing such distinctions. We suggest that previous studies of the relation between motor performance and perceptual awareness have confounded two separate dissociations. These are: (a) the distinction between motoric and perceptual representations, and (b) an orthogonal distinction between (...) conscious and unconscious processes. To articulate these differences more clearly, we propose a new measure of motor awareness, based on subjects' ability to reproduce the spatial details of reaching movements they have just made. Here we focus on the dissociation between motor awareness and perceptual awareness that may occur when subjects make rapid visuomotor adjustments to reaching movements following a target shift. In experiment 1, motor awareness was dissociated from perceptual awareness of a target shift during reaching movement. Participants' reproduction of movement endpoints following visuomotor adjustment was independent of whether they saw the target shift or not. Experiment 2 replicated this result, and further showed that neither motor awareness nor motor performance were disrupted by TMS over the parietal cortex. The neural mechanisms underlying motor awareness, and the implications for theories of consciousness, are discussed. (shrink)

This paper juxtaposes Asian spiritual narratives on meditation alongside medical and scientific narratives that emphasize meditation's efficacy in mitigating distress and increasing well-being. After proposing a working definition of meditation that enables it usefully to be distinguished from categories of similar practices such as prayer, I examine meditation's role in Mind/Body medicine in the West. Here, I survey a number of scientific studies of meditation, including the work of Dr. Herbert Benson and his colleagues who examine a meditational variant they (...) call the ‘Relaxation Response', to examine the breadth of efficacy claims made on behalf of the complex and multidimensional grouping of diverse practices we have come to as ‘meditation'. Among other positive outcomes, meditation has been credited with reducing blood pressure, anxiety, addiction, and stress, while Relaxation Response has been shown to decrease sympathetic nervous system activity, metabolism, pain, anxiety, depression, hostility, and stress. I conclude the paper by suggesting that findings from cognitive neuroscience on the subject of visual imagery can be used to elucidate genres of meditative practice that focus on internal visualization sequences, and I use practices from the Rnying ma tradition of Tibetan Buddhism to illustrate why certain integral aspects of meditation forever will remain beyond scientific grasp. (shrink)

Despite the subjective experience of a continuous and coherent external world, we will argue that the perception and categorisation of visual space is constrained by the spatial resolution of the sensory systems but also and above all, by the pre-reflective representations of the body in action. Recent empirical data in cognitive neurosciences will be presented that suggest that multidimensional categorisation of perceptual space depends on body representations at both an experiential and a functional level. Results will also be resumed that (...) show that representations of the body in action are pre-reflective in nature as only some aspects of the pre-reflective states can be consciously experienced. Finally, a neuro-cognitive model based on the integration of afferent and efferent information will be described, which suggests that action simulation and associated predicted sensory consequences may represent the underlying principle that enables pre-reflective representations of the body for space categorisation and selection for action. (shrink)