Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Methodology
- 1 Analysis of grip forces during object manipulation
- 2 Kinematic assessment of grasping
- 3 Digit forces in multi-digit grasps
- 4 Recordings from the motor cortex during skilled grasping
- 5 Recording of electromyogram activity in the monkey during skilled grasping
- 6 Transcranial magnetic stimulation investigations of reaching and grasping movements
- 7 Neuroimaging of grasping
- 8 Functional magnetic resonance imaging studies of the basal ganglia and precision grip
- 9 Models for the control of grasping
- Part II The physiology of grasping
- Part III The pathophysiology of grasping
- Part IV Therapy of impaired grasping
- Index
- Plate section
- References
4 - Recordings from the motor cortex during skilled grasping
Published online by Cambridge University Press: 23 December 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Methodology
- 1 Analysis of grip forces during object manipulation
- 2 Kinematic assessment of grasping
- 3 Digit forces in multi-digit grasps
- 4 Recordings from the motor cortex during skilled grasping
- 5 Recording of electromyogram activity in the monkey during skilled grasping
- 6 Transcranial magnetic stimulation investigations of reaching and grasping movements
- 7 Neuroimaging of grasping
- 8 Functional magnetic resonance imaging studies of the basal ganglia and precision grip
- 9 Models for the control of grasping
- Part II The physiology of grasping
- Part III The pathophysiology of grasping
- Part IV Therapy of impaired grasping
- Index
- Plate section
- References
Summary
Summary
This chapter offers an overview of the most recent techniques for recording of cortical activity in the awake, behaving monkey. We review the different types of signals that can be extracted from extracellular cortical recordings made with microelectrodes. We also discuss how these signals can be related to dexterous hand movements. This leads us to consider the functional organization of the motor cortex for the control of the distal muscles during grasp.
Introduction
The unique ability of human and non-human primates to interact with their environment is dependent upon the skilled use of the hands for grasping and manipulation of objects. The grasping of objects requires continuous interaction between the sensory processing of the object's physical properties and the motor mechanisms controlling the shape of the hand and the positioning of the hand and digits upon the object. Over the past 30 years, intracortical extracellular recording techniques in the awake monkey have been an essential tool to investigate the organization of the cortical circuits involved in the control of grasp. It has been shown that multiple areas in the parietal and frontal lobes contribute to the transformation from sensory inputs to motor outputs for efficient grasp. This cortical network influences the spinal circuitry that controls the distal hand and digit muscles. Part of this corticospinal control is mediated by direct cortico-motoneuronal (CM) projections from the primary motor cortex (M1) onto motoneurons innervating hand muscles.
- Type
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- Information
- Sensorimotor Control of GraspingPhysiology and Pathophysiology, pp. 52 - 60Publisher: Cambridge University PressPrint publication year: 2009