Bestmann, S and Swayne, O and Blankenburg, F and Ruff, CC and Haggard, P and Weiskopf, N and Josephs, O and Driver, J and Rothwell, JC and Ward, NS (2008) Dorsal premotor cortex exerts state-dependent causal influences on activity in contralateral primary motor and dorsal premotor cortex. CEREB CORTEX , 18 (6) 1281 - 1291. 10.1093/cercor/bhm159.
During voluntary action, dorsal premotor cortex (PMd) may exert influences on motor regions in both hemispheres, but such interregional interactions are not well understood. We used transcranial magnetic stimulation (TMS) concurrently with event-related functional magnetic resonance imaging to study such interactions directly. We tested whether causal influences from left PMd upon contralateral (right) motor areas depend on the current state of the motor system, involving regions engaged in a current task. We applied short bursts (360 ms) of high- or low-intensity TMS to left PMd during single isometric left-hand grips or during rest. TMS to left PMd affected activity in contralateral right PMd and primary motor cortex (M1) in a state-dependent manner. During active left-hand grip, high (vs. low)-intensity TMS led to activity increases in contralateral right PMd and M1, whereas activity decreases there due to TMS were observed during no-grip rest. Analyses of condition-dependent functional coupling confirmed topographically specific stronger coupling between left PMd and right PMd (and right M1), when high-intensity TMS was applied to left PMd during left-hand grip. We conclude that left PMd can exert state-dependent interhemispheric influences on contralateral cortical motor areas relevant for a current motor task.
|Title:||Dorsal premotor cortex exerts state-dependent causal influences on activity in contralateral primary motor and dorsal premotor cortex|
|Open access status:||An open access publication|
|Keywords:||concurrent TMS-fMRI, effective connectivity, grip force, motor preparation, transcallosal inhibition, TRANSCRANIAL MAGNETIC STIMULATION, CORTICOSPINAL SYSTEM INTEGRITY, HUMAN CEREBRAL-CORTEX, FMRI TIME-SERIES, HUMAN BRAIN, FUNCTIONAL-ORGANIZATION, MOVEMENT SELECTION, SUBCORTICAL STROKE, NEURONAL-ACTIVITY, REPETITIVE TMS|
|UCL classification:||UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Psychology and Language Sciences (Division of) > Institute of Cognitive Neuroscience|
UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Neurology > Imaging Neuroscience
UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Neurology > Motor Neuroscience and Movement Disorders
UCL > School of Life and Medical Sciences > Faculty of Life Sciences
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