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Related Experiment Videos

What and when: parallel and convergent processing in motor control.

K Sakai1, O Hikosaka, R Takino

  • 1Department of Physiology, Juntendo University School of Medicine, Tokyo 113, Japan. katz@med.juntendo.ac.jp

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 24, 2000
PubMed
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Motor behavior relies on response selection and timing adjustment. This study used fMRI to show distinct brain regions for each process, with some areas integrating both, advancing our understanding of motor control.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • Successful motor behavior necessitates accurate response selection and precise timing adjustment.
  • Previous psychological research proposed serial processing for these distinct cognitive functions.

Purpose of the Study:

  • To investigate the neural correlates of response selection and timing adjustment using functional magnetic resonance imaging (fMRI).
  • To test the hypothesis of serial and separate processing stages for motor response selection and timing adjustment.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Participants performed a choice reaction time task under four experimental conditions manipulating the requirement for online response selection and timing adjustment.

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Main Results:

  • Distinct neural substrates were identified: anterior medial premotor cortex (presupplementary motor area) for response selection and cerebellar posterior lobe for timing adjustment.
  • Partial functional separation was observed, with lateral premotor cortex and intraparietal sulcus showing activity for both processes.
  • Lateral premotor cortex activity increased when both response selection and timing adjustment were required, suggesting integration or attentional resource allocation.
  • Intraparietal sulcus activity was consistent across conditions requiring either process, indicating a modulatory role.

Conclusions:

  • The findings support a partially separated neural architecture for response selection and timing adjustment in motor behavior.
  • The lateral premotor cortex and intraparietal sulcus play distinct roles in integrating or modulating these processes.
  • Neural activations for response selection and timing adjustment are separable from basic sensory and motor processing.