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Brain areas involved in interlimb coordination: a distributed network.

F Debaere1, S P Swinnen, E Béatse

  • 1Motor Control Laboratory, Department of Radiology, K.U. Leuven, Tervuurse Vest 101, Heverlee, 3001, Belgium.

Neuroimage
|November 8, 2001
PubMed
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The supplementary motor area (SMA) is crucial for coordinating non-homologous limb movements, challenging previous assumptions about its role in only homologous limb coordination.

Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • Understanding the neural basis of interlimb coordination is essential for motor control research.
  • Previous studies primarily focused on homologous limb coordination, leaving nonhomologous coordination less explored.

Purpose of the Study:

  • To investigate the brain areas involved in the cyclical coordination of ipsilateral wrist and foot movements.
  • To determine the role of the supplementary motor area (SMA) in nonhomologous interlimb coordination.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Six healthy subjects performed isolated wrist/foot movements and coordinated ipsilateral wrist-foot movements (isodirectional and nonisodirectional).
  • Auditory pacing at 66 beats/min ensured consistent movement frequency.

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Main Results:

  • Coordinated limb movements activated a network including the SMA, cingulate motor cortex, premotor cortex, primary sensorimotor cortex, and cerebellum.
  • This activation exceeded the sum of activations during isolated limb movements.
  • Nonisodirectional coordination showed greater SMA activation compared to isodirectional coordination.

Conclusions:

  • The supplementary motor area (SMA) plays a significant role in coordinating nonhomologous limb movements within a broader motor network.
  • The established association of the SMA solely with homologous limb coordination requires reevaluation to include nonhomologous limb coordination.