Activity of precentral neurons during torque-triggered hand movements in awake primates

Canadian Journal of Physiology and Pharmacology
Y C WongJ T Murphy

Abstract

In monkeys performing a handle-repositioning task involving primarily wrist flexion-extension (F-E) movements after a torque perturbation was delivered to the handle, single units were recorded extracellularly in the contralateral precentral cortex. Precentral neurons were identified by passive somatosensory stimulation, and were classified into five somatotopically organized populations. Based on electromyographic recordings, it was observed that flexors and extensors about the wrist joint were specifically involved in the repositioning of the handle, while many other muscles which act at the wrist and other forelimb joints were involved in the task in a supportive role. In precentral cortex, all neuronal responses observed were temporally correlated to both the sensory stimuli and the motor responses. Visual stimuli, presented simultaneously with torque perturbations, did not affect the early portion of cortical responses to such torque perturbations. In each of the five somatotopically organized neuronal populations, task-related neurons as well as task-unrelated ones were observed. A significantly larger proportion of wrist (F-E) neurons was related to the task, as compared with the other, nonwrist (F-E) populations. The ab...Continue Reading

Citations

Dec 1, 1992·The Journal of Hand Surgery : Journal of the British Society for Surgery of the Hand·J W Brandsma, P W Brand
Oct 13, 1978·Brain Research·P L Strick, J B Preston
May 1, 1980·The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques·J T MurphyY C Wong

Related Concepts

Metazoa
Anthropoidea
Insula of Reil
Operant Conditioning
Surface Electromyography
Hand
Macaca
Neurons

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