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Related Experiment Videos

Reach plans in eye-centered coordinates.

A P Batista1, C A Buneo, L H Snyder

  • 1Division of Biology and the Computation and Neural Systems Program, California Institute of Technology, Mail Code 216-76, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|July 10, 1999
PubMed
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Neural activity in the posterior parietal cortex suggests that reaching plans are coded in eye-centered coordinates, not arm-centered ones. This eye-centered coding may aid in hand-eye coordination and obstacle avoidance during visually guided movements.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • Visually guided reaching involves transforming visual information into motor commands.
  • The neural basis for planning reaching movements, specifically the reference frame used, remains an area of investigation.
  • Understanding the coordinate system for reach planning is crucial for explaining motor control and potential deficits.

Purpose of the Study:

  • To investigate whether reach targets are coded in an arm-centered or eye-centered reference frame in the posterior parietal cortex.
  • To determine the neural representation underlying visually guided reaching.

Main Methods:

  • Neural activity was recorded from a reach-planning area in the posterior parietal cortex.
  • Analysis focused on characterizing the reference frame (eye-centered vs. arm-centered) of neural responses related to reach targets.

Related Experiment Videos

Main Results:

  • Neural activity in the posterior parietal cortex was found to be more consistent with an eye-centered coding of reach targets.
  • This suggests that the brain plans reaching movements using a coordinate system based on the eyes, rather than the limbs.

Conclusions:

  • The findings support an eye-centered coding scheme for reach planning in the posterior parietal cortex.
  • An eye-centered reference frame offers advantages for integrating visual information, planning movements, and coordinating hand-eye actions, especially in the presence of obstacles.