The effects of preparation and acoustic stimulation on contralateral andipsilateral corticospinal excitability.
Marinovic W; Flannery V; Riek S.Institution Marinovic,Welber. Centre for Sensorimotor Performance, School of Human Movement Studies, The University of Queensland, Australia; School of Psychology, The University of Queensland, Australia. Electronic address: email@example.com
.Flannery,Victoria. School of Psychology, The University of Queensland,
Australia.Riek,Stephan. Centre for Sensorimotor Performance, School of Human Movement Studies, The University of Queensland, Australia.
The effects of preparation and acoustic stimulation on contr
alateral andipsilateral corticospinal excitability.
Human Movement Science. 42:81-8, 2015 Aug.
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 controllin
g 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
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).
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Research Support, Non-U.S. Gov't.