Cortical contributions to sensory gating in the ipsilateral somatosensory cortex during voluntary activity

The Journal of Physiology
Yuming Lei, Monica A Perez

Abstract

It has long been known that the somatosensory cortex gates sensory inputs from the contralateral side of the body. Here, we examined the contribution of the ipsilateral somatosensory cortex (iS1) to sensory gating during index finger voluntary activity. The amplitude of the P25/N33, but not other somatosensory evoked potential (SSEP) components, was reduced during voluntary activity compared with rest. Interhemispheric inhibition between S1s and intracortical inhibition in the S1 modulated the amplitude of the P25/N33. Note that changes in interhemispheric inhibition between S1s correlated with changes in cortical circuits in the ipsilateral motor cortex. Our findings suggest that cortical circuits, probably from somatosensory and motor cortex, contribute to sensory gating in the iS1 during voluntary activity in humans. An important principle in the organization of the somatosensory cortex is that it processes afferent information from the contralateral side of the body. The role of the ipsilateral somatosensory cortex (iS1) in sensory gating in humans remains largely unknown. Using electroencephalographic (EEG) recordings over the iS1 and electrical stimulation of the ulnar nerve at the wrist, we examined somatosensory evoked ...Continue Reading

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Citations

Jul 14, 2017·Journal of Neurophysiology·Recep A Ozdemir, Monica A Perez
May 16, 2020·Neuroscience Letters·Takayuki ItoVincent L Gracco
Apr 23, 2021·Brain Structure & Function·Stéfanie A TremblayClaudine J Gauthier
Jun 28, 2021·Behavioural Brain Research·Ryoki SasakiHideaki Onishi
Jul 1, 2021·The Journal of Physiology·Toshiki Tazoe, Monica A Perez

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