TY  - JOUR
PY  - 2015//
TI  - Motor cortex inhibition is increased during a secondary cognitive task
JO  - Motor control
A1  - Holste, Katherine G.
A1  - Yasen, Alia L.
A1  - Hill, Matthew J.
A1  - Christie, Anita D.
SP  - 380
EP  - 394
VL  - 20
IS  - 4
N2  - The purpose of this study was to assess the effect of a cognitive task on motor cortex excitability and inhibition. Transcranial magnetic stimulation of the motor cortex was performed on 20 healthy individuals (18-24 years; 9 females) to measure evoked potentials (MEPs) and cortical silent periods at baseline, during, and following a secondary cognitive task. The MEP amplitude increased from 0.50 ± 0.09 to 0.87 ± 0.50 mV during a secondary cognitive task (p=0.04), and returned to baseline (0.48 ± 0.31 mV; p=0.90) post-task. The CSP duration also increased from 93.48 ± 28.76 to 113.6 ± 33.68 ms (p=0.001) during the cognitive task, and returned to baseline post-task (89.0 ± 6.9 ms; p=0.88). In the presence of a cognitive task, motor cortex excitability and inhibition were both increased relative to baseline. The increase in inhibition may help to explain the motor deficits experienced while performing a secondary cognitive task.<p />  <p>Language: en</p>
LA  - en
SN  - 1087-1640
UR  - http://dx.doi.org/10.1123/mc.2014-0047
ID  - ref1
ER  -