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Previous literature has shown that there are substantial interlimb differences in coordination during unimanual movements. The dominant arm is typically more efficient in controlling intersegmental dynamics and the nondominant arm has an advantage for maintaining limb posture. Some have suggested that bimanual movements may involve different control strategies than those that are used during unimanual movements. Additionally, research has shown that interlimb differences are less when bimanually congruent joint displacement movements are completed compared to those completed that require congruent hand displacement. The purpose of this experiment was to observe if motor lateralization was affected during bilateral tasks. This was examined by comparing the coordination during unimanual and bimanual reaching movements. In this study, two hypotheses were proposed: 1) the effect of handedness would be reduced when moving bimanually compared to the movements made unimanually and 2) that bimanual movements that required congruent joint displacement would reflect less interlimb differences than those movements made with congruent hand displacement. Subjects were asked to make rapid and concise unimanual and bimanual movements to various targets, each of which had different inertial requirements. Bimanual movements consisted of those which require either congruent joint displacement or congruent hand displacement. Our results showed that interlimb differences in coordination were not changed under bimanual conditions. While we found some differences in coordination between joint congruent and hand congruent conditions, further comparison (outside of this current analysis) suggest that these differences persist during matched unimanual comparison, and therefore cannot be attributed to bimanual movement conditions. Based on our analysis, we suggest that the mechanisms which synchronize bimanual movements may occur upstream in the control process to the expression of motor lateralization and consequently, might not affect the expression of interlimb differences in coordination. This, in turn, indicates that bimanual coordination does not alter the mechanisms that determine intralimb coordination patterns. Additionally, our results challenged the conclusion of a difference in congruent joint displacement and congruent hand displacement movements; rather, the movements were similar in the amount of interlimb differences.
Neuro-Behavioral Determinants of Interlimb Coordination: A multidisciplinary approach focuses on bimanual coordination against the broader context of the coordination between the upper and lower limbs. However, it is also broad in scope in that it reviews recent developments in the study of coordination by means of the latest technologies for the study of brain function, such as functional magnetic resonance imaging, near-infrared spectroscopy, magneto-encephalography, and transcranial magnetic stimulation. In addition, new developments in recovery of interlimb coordination following spinal cord injury and other insults of the central nervous system, such as stroke, are reviewed. Neuro-Behavioral Determinants of Interlimb Coordination: A multidisciplinary approach is intended to be a helpful source of information for scientists in basic research as well as practioners involved in clinical settings. Those who will benefit most are neuroscientists, neurologists, neuropsychologists, cognitive neuroscientists, kinesiologists, motor and rehabilitation scientists, physical therapists etc. Special efforts have been made to make the contents accessible to graduate students by means of review chapters that contain explanatory boxes. We hope to convey our excitement and enthusiasm about the field of interlimb coordination and what it has to offer as a prototypical vehicle for a cognitive neuroscience approach to movement control.
This book brings together scientists from all over the world who have defined and developed the field of Coordination Dynamics. Grounded in the concepts of self-organization and the tools of nonlinear dynamics, appropriately extended to handle informational aspects of living things, Coordination Dynamics aims to understand the coordinated functioning of a variety of different systems at multiple levels of description. The book addresses the themes of Coordination Dynamics and Dynamic Patterns in the context of the following topics: Coordination of Brain and Behavior, Perception-Action Coupling, Control, Posture, Learning, Intention, Attention, and Cognition.
Movement is arguably the most fundamental and important function of the nervous system. Purposive movement requires the coordination of actions within many areas of the cerebral cortex, cerebellum, basal ganglia, spinal cord, and peripheral nerves and sensory receptors, which together must control a highly complex biomechanical apparatus made up of the skeleton and muscles. Beginning at the level of biomechanics and spinal reflexes and proceeding upward to brain structures in the cerebellum, brainstem and cerebral cortex, the chapters in this book highlight the important issues in movement control. Commentaries provide a balanced treatment of the articles that have been written by experts in a variety of areas concerned with movement, including behaviour, physiology, robotics, and mathematics.
foreword by Hermann Haken For the past twenty years Scott Kelso's research has focused on extending the physical concepts of self- organization and the mathematical tools of nonlinear dynamics to understand how human beings (and human brains) perceive, intend, learn, control, and coordinate complex behaviors. In this book Kelso proposes a new, general framework within which to connect brain, mind, and behavior.Kelso's prescription for mental life breaks dramatically with the classical computational approach that is still the operative framework for many newer psychological and neurophysiological studies. His core thesis is that the creation and evolution of patterned behavior at all levels--from neurons to mind--is governed by the generic processes of self-organization. Both human brain and behavior are shown to exhibit features of pattern-forming dynamical systems, including multistability, abrupt phase transitions, crises, and intermittency. Dynamic Patterns brings together different aspects of this approach to the study of human behavior, using simple experimental examples and illustrations to convey essential concepts, strategies, and methods, with a minimum of mathematics. Kelso begins with a general account of dynamic pattern formation. He then takes up behavior, focusing initially on identifying pattern-forming instabilities in human sensorimotor coordination. Moving back and forth between theory and experiment, he establishes the notion that the same pattern-forming mechanisms apply regardless of the component parts involved (parts of the body, parts of the nervous system, parts of society) and the medium through which the parts are coupled. Finally, employing the latest techniques to observe spatiotemporal patterns of brain activity, Kelso shows that the human brain is fundamentally a pattern forming dynamical system, poised on the brink of instability. Self-organization thus underlies the cooperative action of neurons that produces human behavior in all its forms.
This collection of contributions on the subject of the neural mechanisms of sensorimotor control resulted from a conference held in Cairns, Australia, September 3-6, 2001. While the three of us were attending the International Union of Physiological Sciences (IUPS) Congress in St Petersburg, Russia, in 1997, we discussed the implications of the next Congress being awarded to New Zealand. We agreed to organise a satellite to this congress in an area of mutual interest -the neuroscience of movement and sensation. Australia has a long-standing and enviable reputation in the field of neural mechanisms of sensorimotor control. Arguably this reached its peak with the award of a Nobel Prize to Sir John Eccles in 1963 for his work on synaptic transmission in the central nervous system. Since that time, the subject of neuroscience has progressed considerably. One advance is the exploitation of knowledge acquired from animal experiments to studies on conscious human subjects. In this development, Australians have achieved international prominence, particularly in the areas of kinaesthesia and movement control. This bias is evident in the choice of subject matter for the conference and, subsequently, this book. It was also decided to assign a whole section to muscle mechanics, a subject that is often left out altogether from conferences on motor control. Cairns is a lovely city and September is a good time to visit it.
An overview of the central role in cognitive neuroscience of the corpus callosum, the bands of tissue connecting the brain's two hemispheres.
This volume evolved from a workshop which addressed the general area of motor control, and the broader problems of serial organisation and sensory-motor integration of human skills. A number of specific issues are highlighted, including the neural mechanisms and disabilities of sensory-motor integration, planning and programming of action, the dynamics of interlimb coordination, amendment and updating mechanisms, and in particular, perception-action coupling and the representation of action. Underlying much of the volume are the major theoretical issues which include the debate between computational and prescriptive approaches versus the emergent properties and system dynamics approaches. The book represents a diverse approach from such disciplines as psychology, electrical and mechanical engineering, human movement studies, physiotherapy, neurology, and kinesiology.
This comprehensive edited treatise discusses the neurological, physiological, and cognitive aspects of interlimb coordination. It is unique in promoting a multidisciplinary perspective through introductory chapter contributions from experts in the neurosciences, experimental and developmental psychology, and kinesiology. Beginning with chapters defining the neural basis of interlimb coordination in animals, the book progresses toward an understanding of human locomotor control and coordination and the underlying brain structures and nerves that make such control possible. Section two focuses on the dynamics of interlimb coordination and the physics of movement. The final section presents information on how practice and experience affect coordination, including general skill acquisition, learning to walk, and the process involved in rhythmic tapping.
One of the most striking features of Coordination Dynamics is its interdisciplinary character. The problems we are trying to solve in this field range from behavioral phenomena of interlimb coordination and coordination between stimuli and movements (perception-action tasks) through neural activation patterns that can be observed during these tasks to clinical applications and social behavior. It is not surprising that close collaboration among scientists from different fields as psychology, kinesiology, neurology and even physics are imperative to deal with the enormous difficulties we are facing when we try to understand a system as complex as the human brain. The chapters in this volume are not simply write-ups of the lectures given by the experts at the meeting but are written in a way that they give sufficient introductory information to be comprehensible and useful for all interested scientists and students.