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

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

Reviews in the Neurosciences

|June 8, 2001

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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.

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.

Related Experiment Videos

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.