Inhibition during response preparation is sensitive to response complexity.
نویسندگان
چکیده
Motor system excitability is transiently suppressed during the preparation of movement. This preparatory inhibition is hypothesized to facilitate response selection and initiation. Given that demands on selection and initiation processes increase with movement complexity, we hypothesized that complexity would influence preparatory inhibition. To test this hypothesis, we probed corticospinal excitability during a delayed-response task in which participants were cued to prepare right- or left-hand movements of varying complexity. Single-pulse transcranial magnetic stimulation was applied over right primary motor cortex to elicit motor evoked potentials (MEPs) from the first dorsal interosseous (FDI) of the left hand. MEP suppression was greater during the preparation of responses involving coordination of the FDI and adductor digiti minimi relative to easier responses involving only the FDI, independent of which hand was cued to respond. In contrast, this increased inhibition was absent when the complex responses required sequential movements of the two muscles. Moreover, complexity did not influence the level of inhibition when the response hand was fixed for the trial block, regardless of whether the complex responses were performed simultaneously or sequentially. These results suggest that preparatory inhibition contributes to response selection, possibly by suppressing extraneous movements when responses involve the simultaneous coordination of multiple effectors.
منابع مشابه
Inhibition during response preparation is sensitive to response complexity 1
7 *Corresponding author: 8 Ian Greenhouse 9 Department of Psychology, University of California, Berkeley, Berkeley, California 10 3210 Tolman Hall, Berkeley, California 94720-1650 11 Phone: 617 642 4828 12 Email: [email protected] 13 14 15 16 Pages: 28 17 18 Figures: 4 19 20 Abstract: 202 words 21 22 23 24 Running head: Preparatory Inhibition and Response Complexity 25 26
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عنوان ژورنال:
- Journal of neurophysiology
دوره 113 7 شماره
صفحات -
تاریخ انتشار 2015