Journal
BRAIN SCIENCES
Volume 9, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/brainsci9080177
Keywords
dorsolateral prefrontal cortex; primary motor cortex; transcranial magnetic stimulation; connectivity; motor control
Categories
Funding
- Canadian Institutes of Health Research (CIHR) Foundation [FDN 154292]
- CIHR
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Parkinson's Canada
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Dual-site transcranial magnetic stimulation to the primary motor cortex (M1) and dorsolateral prefrontal cortex (DLPFC) can be used to probe functional connectivity between these regions. The purpose of this study was to characterize the effect of DLPFC stimulation on ipsilateral M1 excitability while participants were at rest and contracting the left- and right-hand first dorsal interosseous muscle. Twelve participants were tested in two separate sessions at varying inter-stimulus intervals (ISI: 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, and 20 ms) at two different conditioning stimulus intensities (80% and 120% of resting motor threshold). No significant effect on ipsilateral M1 excitability was found when applying a conditioning stimulus over DLPFC at any specific inter-stimulus interval or intensity in either the left or right hemisphere. Our findings suggest neither causal inhibitory nor faciliatory influences of DLPFC on ipsilateral M1 activity while participants were at rest or when performing an isometric contraction in the target hand muscle.
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