Effects on muscle activity from microstimuli applied to somatosensory and motor cortex during voluntary movement in the monkey

Journal of Neurophysiology
G Widener, P D Cheney

Abstract

It is well known that electrical stimulation of primary somatosensory cortex (SI) evokes movements that resemble those evoked from primary motor cortex. These findings have led to the concept that SI may possess motor capabilities paralleling those of motor cortex and speculation that SI could function as a robust relay mediating motor responses from central and peripheral inputs. The purpose of this study was to rigorously examine the motor output capabilities of SI areas with the use of the techniques of spike- and stimulus-triggered averaging of electromyographic (EMG) activity in awake monkeys. Unit recordings were obtained from primary motor cortex and SI areas 3a, 3b, 1, and 2 in three rhesus monkeys. Spike-triggered averaging was used to assess the output linkage between individual cells and motoneurons of the recorded muscles. Cells in motor cortex producing postspike facilitation (PSpF) in spike-triggered averages of rectified EMG activity were designated corticomotoneuronal (CM) cells. Motor output efficacy was also assessed by applying stimuli through the microelectrode and computing stimulus-triggered averages of rectified EMG activity. One hundred seventy-one sites in motor cortex and 68 sites in SI were characteri...Continue Reading

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Citations

May 28, 2004·Journal of Neurophysiology·Michael C ParkPaul D Cheney
Dec 24, 2013·Brain and Behavior·Masataka SuzukiRyusuke Kakigi
Sep 13, 2018·Journal of Neurophysiology·Wan JiangC Elaine Chapman
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Jul 17, 2019·Science Advances·Tatsuya UmedaYukio Nishimura
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Apr 18, 2021·Annual Review of Neuroscience·Peter L StrickJean-Alban Rathelot

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