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This volume is a compilation of current research on somatosensation and its underlying mechanisms written by international experts from a broad range of disciplines. It is divided into six sections:· structural basis of information processing and neocortical neurotransmitters · psychophysics of somatosensation · cortical representation of somatosensation · sensory-motor interface · neuronal population behavior · cortical neurocomputation and modelling. It highlights not only important new findings but also novel methods and technologies applied to major unresolved issues in the field of neuroscience. The number of methods for investigating the neural mechanisms of soma-tosensory perception has grown substantially in the last decade. The book encompasses levels of inquiry from ionic channels, single unit recordings of neural activity, and functional brain imaging of the coordinated activity of large neuronal ensembles to human psychophysics of controlled somatic stimulation. This work is of great value for researchers and students interested in the dynamic neuronal mechanisms involved in the complex processes of sensory perception and provides a picture of our present understanding of the neural representation of the external world relayed through the somatosensory system.
Exploring new and past research in the understanding of how the brain deals with its own body image, this book provides a review of pertinent literature and offers comprehensive descriptions of technical approaches. The material includes new frameworks for the conceptualization of the system's representations, scientific and clinical applications that stem from these approaches based on the new concepts, and a discussion of tools used to study the interface of the brain and the body. The book provides computational strategies for sensorimotor integration of the mammalian brain and includes algorithms for the design and implementation of haptic interfaces and tactile displacement.
The diversity of contemporary investigative approaches included in this volume provides an exciting account of our current understanding of brain mechanisms responsible for sensory and perceptual experience in the areas of touch, kinesthesia, and pain. Postgraduate research students in sensory physiology, neurology, psychology and anatomy, and researchers themselves will find that this volume addresses many of the key issues in our attempts to understand the neural mechanisms that mediate sensory experience arising from the body as a whole, the so-called somatic senses, in particular for touch and pain. The volume provides a record of the occasion of the St Petersburg IUPS symposium, chaired by the editors of this volume, and includes some added recent contributions from other leading international figures in the field. Brought together under the sponsoring banner of the IUPS Commission for Somatosensory Physiology and Pain, these scientists with their different experimental approaches seek collectively to understand the brain mechanisms that underlie our own nature and experience.
Volume 5 of Cerebral Cortex completes the sequence of three volumes on the individual functional areas of the cerebral cortex by covering the somatosensory and motor areas. However, the chapters on these areas lead naturally to a series of others on patterns of connectivity in the cortex, intracortical and subcortical, so that the volume as a whole achieves a much broader viewpoint. The individual chapters on the sensory-motor areas reflect the considerable diversity of interest within the field, for each of the authors has given his or her chapter a different emphasis, reflecting in part topical interest and in part the body of data resulting from work in a particular species. In considering the functional organization of the somatosensory cortex, Robert Dykes and Andre Ruest have chosen to concentrate on the nature of the mapping process and its significance. Harold Burton, in his chapter on the somatosensory fields buried in the sylvian fissure, shows how critical is an understanding of this mapping process in the functional subdivision of the cortex. A frequently overlooked subdivision of the cortex, the vestibular region, is given the emphasis it deserves in a chapter by John Fredrickson and Allan Rubin. The further functional subdivisions that occur within the first somatosensory area are given an anatom ical basis in the review by Edward Jones of connectivity in the primate sensory motor cortex.
Vernon Mountcastle has devoted his career to studying the neurophysiology of sensation in the hand. In The Sensory Hand he provides an astonishingly comprehensive account of the neural underpinnings of the rich and complex tactile experiences evoked by stimulation of the hand.
In April 1979 a symposium on "Multiple Somatic Sensory Motor, Visual and Auditory Areas and Their Connectivities" was held at the FASEB meeting in Dallas, Texas. The papers presented at that symposium are the basis of most of the substantially augmented, updated chapters in the three volumes of Cortical Sensory Organi zation. Only the material in chapter 8 of volume 3 was not pre sented in one form or another at that meeting. The aim of the symposium was to review the present status of the field of cortical representation in the somatosensory, visual and auditory systems. Since the early 1940s, the number of recognized cortical areas related to each of these systems has been increasing until at present the number of visually related areas exceeds a dozen. Although the number is less for the somatic and auditory systems, these also are more numerous than they were earlier and are likely to increase still further since we may expect each system to have essentially the same number of areas related to it.
Bringing together neural, perceptual, and behavioral studies, The Merging of the Senses provides the first detailed review of how the brain assembles information from different sensory systems in order to produce a coherent view of the external world. Stein and Meredith marshall evidence from a broad array of species to show that interactions among senses are the most ancient scheme of sensory organization, an integrative system reflecting a general plan that supersedes structure and species. Most importantly, they explore what is known about the neural processes by which interactions among the senses take place at the level of the single cell.The authors draw on their own experiments to illustrate how sensory inputs converge (from visual, auditory, and somatosensory modalities, for instance) on individual neurons in different areas of the brain, how these neurons integrate their inputs, the principles by which this integration occurs, and what this may mean for perception and behavior. Neurons in the superior colliculus and cortex are emphasized as models of multiple sensory integrators.
The somatosensory system is a diverse sensory system comprising the receptors and processing centres to produce the sensory modalities such as touch, temperature, proprioception (body position), and nociception (pain). This book gives an overview of the methodology for investigation of pain in neuroimaging studies and the relevant structures of the lateral pain system. Furthermore, classic studies understand the body map representation in primary somatosensory cortex (SI) as fix and reflecting the physical location of peripheral stimulation in the form of the famous somatosensory homunculus. This book reports the results of recent studies that challenge this view and suggest a more complex role of SI. Also dealt with in this book is the current state and perspective of neurotechnology, particular the use of brain computer interfaces (BCI) and neurostimulation in the rehabilitation of stroke. Future developments and prospects such as the combination of BCI systems with non-invasive form of neurostimulation and functional electric stimulation (FES) is examined as well. Other chapters include a review of research done in the primary somatosensory cortex implicated in the pathogenesis of absence epilepsy, an analysis of the development of non-invasive neuroimaging techniques that have enabled the study of S1 more widely, and an electrophysiological investigation of central neuronal responses evoked by CO2 laser pulses to study evoked responses and thermal pain sensation.
In April 1979 a symposium on "Multiple Somatic Sensory Motor, Visual and Auditory Areas and Their Connectivities" was held at the FASEB meeting in Dallas, Texas. The papers presented at that symposium are the basis of most of the substantially augmented, updated chapters in the three volumes of Cortical Sensory Organi zation. Only the material in chapter 8 of volume 3 was not pre sented in one form or another at that meeting. The aim of the symposium was to review the present status of the field of cortical representation in the somatosensory, visual and auditory systems. Since the early 1940s, the number of recognized cortical areas related to each of these systems has been increasing until at present the number of visually related areas exceeds a dozen. Although the number is less for the somatic and auditory systems, these also are more numerous than they were earlier and are likely to increase still further since we may expect each system to have essentially the same number of areas related to it.
The somatosensory system is unique in that it conveys information to the central nervous system (CNS) about both external and internal sensory environments. Recent technological and conceptual advances in the field have allowed great strides to be made in the description and understanding of how the CNS manages information about its own image. This knowledge, apart from its obvious scientific merit, is quickly leading to clinical applications in the realm of neurorehabilitation after the peripheral nerve injury and during recovery from stroke. The Somatosensory System: Deciphering the Brain's Own Body Image presents both new and past research in the understanding of how the brain deals with its own body image. It provides a review of pertinent literature and offers comprehensive descriptions of state-of-the-art technical approaches. The material includes new frameworks for the conceptualization of the system's representations, scientific and clinical applications that stem from these approaches based on the new concepts, and a discussion of new directions and new tools for the study of the interface of the brain and the body.