TL;DR: Illustration de trois fonctions principales qui sont predominantes dans l'etude de l'intervention de l'sattention dans les processus cognitifs: 1) orientation vers des evenements sensoriels; 2) detection des signaux par processus focal; 3) maintenir la vigilance en etat d'alerte
Abstract: : The concept of attention as central to human performance extends back to the start of experimental psychology, yet even a few years ago, it would not have been possible to outline in even a preliminary form a functional anatomy of the human attentional system. New developments in neuroscience have opened the study of higher cognition to physiological analysis, and have revealed a system of anatomical areas that appear to be basic to the selection of information for focal (conscious) processing. The importance of attention is its unique role in connecting the mental level of description of processes used in cognitive science with the anatomical level common in neuroscience. Sperry describes the central role that mental concepts play in understanding brain function. As is the case for sensory and motor systems of the brain, our knowledge of the anatomy of attention is incomplete. Nevertheless, we can now begin to identify some principles of organization that allow attention to function as a unified system for the control of mental processing. Although many of our points are still speculative and controversial, we believe they constitute a basis for more detailed studies of attention from a cognitive-neuroscience viewpoint. Perhaps even more important for furthering future studies, multiple methods of mental chronometry, brain lesions, electrophysiology, and several types of neuro-imaging have converged on common findings.
TL;DR: Neuroimaging studies, combined with other methods, are revealing the ways in which imagery draws on mechanisms used in other activities, such as perception and motor control.
Abstract: Mental imagery has, until recently, fallen within the purview of philosophy and cognitive psychology. Both enterprises have raised important questions about imagery, but have not made substantial progress in answering them. With the advent of cognitive neuroscience, these questions have become empirically tractable. Neuroimaging studies, combined with other methods (such as studies of brain-damaged patients and of the effects of transcranial magnetic stimulation), are revealing the ways in which imagery draws on mechanisms used in other activities, such as perception and motor control. Because of its close relation to these basic processes, imagery is now becoming one of the best understood 'higher' cognitive functions.
TL;DR: The data support the proposition that the latency of P300 corresponds to stimulus evaluation time and is independent of response selection.
Abstract: A technique for measuring the latency of the P300 component of event-related brain potentials on individual trials is described. Choice reaction times and the latency of the P300 were compared under speed-maximizing and under accuracy-mazimising instructions. The choice stimuli required different levels of semantic categorization. The data support the proposition that the latency of P300 corresponds to stimulus evaluation time and is independent of response selection.
TL;DR: The study of visual dominance provides a model situation in which chronometric and phenomenological techniques can be brought together to produce a more complete picture of the relation between information processing and awareness.
Abstract: In many situations, visual input tends to dominate other modalities in perceptual and memorial reports and in speeded responses. Visual dominance appears to be related to the relatively weak capacity of visual inputs to alert the organism to their occurrence. In response to this reduced alerting, subjects tend to keep their attention tuned to the visual modality. This bias works via prior entry to allow vision to control the mechanisms that subserve conscious reports. The study of visual dominance provides a model situation in which chronometric and phenomenological techniques can be brought together to produce a more complete picture of the relation between information processing and awareness. Process models of perceptual phenomena (Chase, 1973) usually emphasize the flow of information within and between such systems as visual and acoustic analyzers, short- and long-term memories, and decision and response systems. Most often, some form of mental chronometry (Posner, in press), such
TL;DR: The actual and potential benefits of a marriage between cognitive psychology and psychophysiology are reviewed and the lateralized readiness potential, a measure of electrical brain activity that is related to preparation for movement, is reviewed.
Abstract: This paper reviews the actual and potential benefits of a marriage between cognitive psychology and psychophysiology. Psychophysiological measures, particularly those of the event-related brain potential, can be used as markers for psychological events and physiological events. Thus, they can serve as "windows" on the mind and as "windows" on the brain. These ideas are illustrated in the context of a series of studies utilizing the lateralized readiness potential, a measure of electrical brain activity that is related to preparation for movement. This measure has been used to illuminate presetting processes that prepare the motor system for action, to demonstrate the presence of the transmission of partial information in the cognitive system, and to identify processes responsible for the inhibition of responses. The lateralized readiness potential appears to reflect activity in motor areas of cortex. Thus, this measure, along with other psychophysiological measures, can be used to understand how the functions of the mind are implemented in the brain.