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Related Experiment Videos

Functionally specific reorganization in human premotor cortex.

Jacinta O'Shea1, Heidi Johansen-Berg, Danielle Trief

  • 1Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, United Kingdom. jacinta.oshea@psy.ox.ac.uk

Neuron
|May 8, 2007
PubMed
Summary
This summary is machine-generated.

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Following a stroke, the intact brain hemisphere compensates for damage. This study shows that increased activity in the right dorsal premotor cortex (PMd) helps preserve motor function after disrupting the left PMd.

Area of Science:

  • Neuroscience
  • Motor Control
  • Brain Plasticity

Background:

  • Unilateral stroke often leads to increased activity in the dorsal premotor cortex (PMd) of the intact hemisphere during affected limb movement.
  • The precise role of this compensatory activation in motor recovery remains uncertain.

Purpose of the Study:

  • To investigate short-term functional reorganization in the right PMd following disruption of the dominant left PMd.
  • To determine if this reorganization causally contributes to preserving motor behavior.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to observe brain activity.
  • Transcranial magnetic stimulation (TMS) was used to temporarily disrupt the function of the left PMd.
  • Behavioral tasks assessed motor performance before and after TMS.

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Main Results:

  • Disruption of the left PMd by TMS led to increased activity in the right PMd and connected medial premotor areas, even without behavioral deficits.
  • This compensatory activation was specific to action selection phases, not action execution.
  • The observed reorganization was functionally and anatomically specific, differing from the effects of TMS on the sensorimotor cortex.
  • Subsequent TMS of the reorganized right PMd impaired performance, indicating its crucial role.

Conclusions:

  • Functional reorganization in the right PMd plays a causal role in maintaining behavioral performance after neuronal challenge to the dominant hemisphere.
  • This compensatory mechanism highlights the brain's capacity for adaptation following injury.