Visual salience of the stop signal affects the neuronal dynamics of controlled inhibition.

Abstract:

:The voluntary control of movement is often tested by using the countermanding, or stop-signal task that sporadically requires the suppression of a movement in response to an incoming stop-signal. Neurophysiological recordings in monkeys engaged in the countermanding task have shown that dorsal premotor cortex (PMd) is implicated in movement control. An open question is whether and how the perceptual demands inherent the stop-signal affects inhibitory performance and their underlying neuronal correlates. To this aim we recorded multi-unit activity (MUA) from the PMd of two male monkeys performing a countermanding task in which the salience of the stop-signals was modulated. Consistently to what has been observed in humans, we found that less salient stimuli worsened the inhibitory performance. At the neuronal level, these behavioral results were subtended by the following modulations: when the stop-signal was not noticeable compared to the salient condition the preparatory neuronal activity in PMd started to be affected later and with a less sharp dynamic. This neuronal pattern is probably the consequence of a less efficient inhibitory command useful to interrupt the neural dynamic that supports movement generation in PMd.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pani P,Giarrocco F,Giamundo M,Montanari R,Brunamonti E,Ferraina S

doi

10.1038/s41598-018-32669-8

subject

Has Abstract

pub_date

2018-09-24 00:00:00

pages

14265

issue

1

issn

2045-2322

pii

10.1038/s41598-018-32669-8

journal_volume

8

pub_type

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