The effects of preparation and acoustic stimulation on contralateral and ipsilateral corticospinal excitability

Marinovic, Welber, Flannery, Victoria and Riek, Stephan (2015) The effects of preparation and acoustic stimulation on contralateral and ipsilateral corticospinal excitability. Human Movement Science, 42 81-88. doi:10.1016/j.humov.2015.05.003


Author Marinovic, Welber
Flannery, Victoria
Riek, Stephan
Title The effects of preparation and acoustic stimulation on contralateral and ipsilateral corticospinal excitability
Journal name Human Movement Science   Check publisher's open access policy
ISSN 1872-7646
0167-9457
Publication date 2015-08-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.humov.2015.05.003
Volume 42
Start page 81
End page 88
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Abstract A loud auditory stimulus (LAS) presented together with an imperative stimulus during preparation for motor actions can speed their initiation. The effects of LAS on corticospinal excitability (CSE), however, depend on the state of preparation of the motor system for action. CSE also depends on the brain hemisphere controlling the responding limb. Usually, CSE is increased just before movement onset in the hemisphere controlling the movement and inhibited on the other side. This study investigated the impact of LAS on CSE of the contralateral and ipsilateral hemispheres, while participants prepared for a voluntary abduction of the index finger. In Experiment 1, we attempted to identify the pattern of modulation of the ipsilateral cortex (resting side) by determining the time course of corticospinal changes in anticipatory timing actions using transcranial magnetic stimulation. In Experiment 2, we investigated the impact of LAS on the ipsilateral and contralateral CSE during anticipatory preparation. Results found no modulation of ipsilateral CSE during preparation, but indicate an increase in CSE after EMG onset on the acting limb. Moreover, we found that LAS presentation increased CSE on the contralateral side (active side).
Keyword Auditory stimulus
Motor control
Motor cortex
Movement preparation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Thu, 04 Jun 2015, 20:46:27 EST by Sandrine Ducrot on behalf of School of Human Movement and Nutrition Sciences