The abilities to attribute an action to its proper agent and to understand its meaning when it is produced by someone else are basic aspects of human social communication. Several psychiatric syndromes, such as schizophrenia, seem to lead to a dysfunction of the awareness of one’s own action as well as of recognition of actions performed by other. Such syndromes offer a framework for studying the determinants of agency, the ability to correctly attribute actions to their veridical source. Thirty normal (...) subjects and 30 schizophrenic patients with and without hallucinations and/or delusional experiences were required to execute simple finger and wrist movements, without direct visual control of their hand. The image of either their own hand or an alien hand executing the same or a different movement was presented on a TV-screen in real time. The task for the subjects was to discriminate whether the hand presented on the screen was their own or not. Hallucinating and deluded schizophrenic patients were more impaired in discriminating their own hand from the alien one than the non-hallucinating ones, and tended to misattribute the alien hand to themselves. Results are discussed according to a model of action control. A tentative description of the mechanisms leading to action consciousness is proposed. (shrink)

Introduction. Whatever its underlying causes, even the description of the phenomenon of thought insertion, of the content of the delusion, presents difficulty. It may seem that the best hope of a description comes from a broadly cognitivist approach to the mind which construes content-laden mental states as internal mental representations within what is literally an inner space: the space of the brain or nervous system. Such an approach objectifies thoughts in a way which might seem to hold out the prospect (...) of describing the ''alienated'' relation to one's own thoughts that seems to be present in thought insertion.1 Method. Firstly, I examine the general structure of cognitivist accounts of intentional or content-laden mental states. I raise the general difficulty of explaining how free-standing, and thus world-independent, inner states can still have bearing on the outer world. Secondly, I briefly examine Frith's model for explaining thought insertion and other passivity phenomena by postulating a failure of an internal monitoring mechanism of inner states. I question what account can be given of non-pathological cases and raise two specific objects. Results. Cognitivist accounts of the mind face a general, and possibly insuperable, challenge: explaining the intentionality of mental states in non-intentional, non- question-begging terms. There have so far been no satisfactory solutions. Cognitivist accounts of passivity phenomena in terms of a failure of internal monitoring face two objections. Firstly, accounting for non-pathological cases generates an infinite regress. Secondly, no account can be given of the paradoxical nature of utterances of the form of Moore's paradox: ''it is raining but I do not believe it''. Conclusions. A cognitivist approach presents an alienated account of thought in normal, non-pathological cases and is no help in accounting for thought insertion. (shrink)

Although philosophical approaches to the self are diverse, several of them are relevant to cognitive science. First, the notion of a 'minimal self', a self devoid of temporal extension, is clarified by distinguishing between a sense of agency and a sense of ownership for action. To the extent that these senses are subject to failure in pathologies like schizophrenia, a neuropsychological model of schizophrenia may help to clarify the nature of the minimal self and its neurological underpinnings. Second, there is (...) good evidence to suggest that although certain aspects of the minimal self are primitive and embodied, other aspects may be accessed only in reflective consciousness. Employing a modified concept of the minimal self, it may be possible to construct a robotic form of non-conscious self-reference that depends on an interaction between the robotic body and its environment. In contrast to the minimal self, the narrative self involves continuity over time and is directly relevant to discussions of memory and personal identity. There is growing consensus among philosophers and cognitive scientists about the importance of narrative and its relation to episodic memory and left-hemisphere functions. There are, however, at least two different views of how the narrative self is structured. On one model it is nothing more than an abstract point. On a more extended view, proposed here, the self is a rich amalgam of narratives that allows for the equivocations, contradictions, and self-deceptions of personal life. Even in this case, however, neurocognitive models contribute to our understanding of how narrative identity is structured. (shrink)

What we perceive is the product of an intrinsic process and not part of external physical reality. This notion is consistent with the philosophical position of transcendental idealism but also agrees with physiological findings on the thalamocortical system. -Frequency rhythms of discharge activity from thalamic and cortical neurons are facilitated by cholinergic arousal and resonate in thalamocortical networks, thereby transiently forming assemblies of coherent oscillations under constraints of sensory input and prefrontal attentional mechanisms. Perception and conscious experience may be based (...) on such assemblies and sensory input to thalamic nuclei plays merely a constraining role in their formation. In schizophrenia, the ability of sensory input to modulate self-organisation of thalamocortical activity may be generally reduced. If during arousal thalamocortical self-organisation is underconstrained by sensory input, then attentional mechanisms alone may determine the content of perception and hallucinations may arise. (shrink)

If the notion of free will is to be retained by philosophers, psychiatrists and psychologists, then it will be a free will which is essentially non-conscious. The purpose of this paper is to demonstrate that a conscious free will (in the sense of consciousness initiating action) is incompatible with the evidence of neuroscience, and the phenomenology described in the literature of normal creativity, psychotic passivity, and the neurological syndrome of the alien limb or hand. In particular the work of Libet (...) and others who have directly stimulated the brain and measured activity from its surface leads to the conclusion that subjective states (be they sensory or intentional) are preceded by predictive neural activity. Subjective phenomenology is temporally distinct from the initiation of “voluntary” action. In addition it will be argued that free will is more than a belief and that it comprises a perceptual sensorimotor component. Free will is conceptualized as a three component phenomenon consisting of a perceptual, non-linguistic experience of freedom, an experiential belief which is linguistic, and related to a specified action in time, and an abstract belief which is linguistic but remote from any particular action and akin to philosophical discourse (the abstract belief or otherwise, in free will). A theoretical explanation of some of the pathological phenomenology of possession of action is offered in terms of temporal considerations. The direction of action within mental/virtual space is hypothesized to be a function of the temporal sequence of its initiation and awareness of the latter “reaching” consciousness. It is suggested that perturbation of this temporal sequence may lead to the misattribution of host-as-alien-initiated action. Work of this kind, which is beyond subjective introspection, is necessary if we are to develop adequate models to use in conjunction with modern investigation techniques. (shrink)