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Related Experiment Videos

Is reaching eye-centered, body-centered, hand-centered, or a combination?

M S Graziano1

  • 1Department of Psychology, Princeton University, NJ 08544, USA. graziano@princeton.edu

Reviews in the Neurosciences
|June 8, 2001
PubMed
Summary

Neural circuits for visually guided reaching involve distinct spatial frames. Eye-centered and body-centered representations may integrate into a hand-centered frame in premotor cortex.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • Visually guided reaching is crucial for interacting with the environment.
  • The neural basis of reaching involves transforming visual target information into motor commands.
  • Several brain regions, including the parietal and premotor cortices, are implicated in this process.

Purpose of the Study:

  • To review and synthesize current views on the neural mechanisms underlying visually guided reaching.
  • To explore how different spatial reference frames are represented and integrated in the brain during reaching movements.

Main Methods:

  • Literature review and theoretical synthesis of existing research.
  • Analysis of proposed neural models for spatial transformations in reaching.

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Main Results:

  • Three primary views exist: superior parietal lobe (body-centered), intraparietal sulcus (eye-centered), and caudal premotor cortex (hand-centered).
  • These frameworks are not mutually exclusive and likely interact.
  • Integration of eye-centered target and body-centered limb information may form a hand-centered representation.

Conclusions:

  • A hierarchical or integrated model of spatial processing is proposed for visually guided reaching.
  • The caudal premotor cortex and primary motor cortex may serve as a crucial stage for generating hand-centered motor commands.