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Related Experiment Videos

Parietal cortex and movement. I. Movement selection and reaching

M F Rushworth1, P D Nixon, R E Passingham

  • 1Department of Experimental Psychology, University of Oxford, UK. matthew.rushworth@psy.ox.ac.uk

Experimental Brain Research
|January 7, 1998
PubMed
Summary
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Selective parietal cortex lesions reveal distinct roles in sensory-motor transformations. Areas 7a/7ab/LIP are crucial for visual-motor control, while areas 5/7b/MIP are vital for proprioceptive-based movements.

Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory-Motor Integration

Background:

  • Parietal cortex activity is linked to sensory input and movement.
  • Understanding parietal cortex function in sensory-motor transformations is crucial for motor control research.

Purpose of the Study:

  • To investigate the distinct roles of parietal cortex subregions in sensory-motor transformations.
  • To assess the impact of selective parietal lesions on visually guided and proprioceptively guided reaching tasks.

Main Methods:

  • Three experiments were conducted on monkeys involving two reaching tasks (light and dark) and a conditional motor task.
  • Bilateral lesions were made in two distinct groups of parietal cortex areas: 5, 7b, and MIP, or 7a, 7ab, and LIP.
  • Performance was evaluated on visually guided reaching, proprioceptively guided reaching, and a non-spatial conditional motor task.

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Main Results:

  • Lesions in areas 7a, 7ab, and LIP impaired visually guided reaching but not reaching in the dark.
  • Lesions in areas 5, 7b, and MIP impaired reaching in the dark but had minimal effect on visually guided reaching.
  • Both lesion groups successfully performed the non-spatial conditional motor task, indicating preserved response selection.

Conclusions:

  • The parietal cortex is divided into distinct functional areas for organizing limb movements.
  • Area 7a/7ab/LIP is essential for visual-motor transformations and spatial coordination using visual information.
  • Area 5/7b/MIP is essential for spatial coordination of arm movements based on proprioceptive and efference copy information.