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Related Experiment Videos

Two distinct modes of control for object-directed action.

Melvyn A Goodale1, David A Westwood, A David Milner

  • 1CIHR Group on Action and Perception, Department of Psychology, University of Western Ontario, London, ON N6A 5C2, Canada. mgoodale@uwo.ca

Progress in Brain Research
|December 4, 2003
PubMed
Summary

Visually guided actions use separate brain pathways for real-time and memory-driven movements. Real-time actions rely on dorsal stream visuomotor mechanisms, while memory-driven actions use ventral stream representations.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • Visually guided actions involve multiple pathways from perception to motor execution.
  • Understanding when and how these pathways are recruited remains an open question.

Purpose of the Study:

  • To differentiate the neural mechanisms underlying real-time versus memory-driven visually guided actions.
  • To elucidate the type of information processed by distinct visuomotor pathways.

Main Methods:

  • The study proposes a theoretical framework based on existing neuroscientific literature.
  • It contrasts the computational properties of dorsal and ventral stream pathways in action planning.

Main Results:

  • Real-time actions to visible targets engage dorsal stream visuomotor mechanisms for egocentric coordinate computation.

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  • Memory-driven actions utilize ventral stream representations and scene-based coordinates for planning after target disappearance.

    • Conclusions:

    • Distinct pathways mediate real-time and memory-driven visually guided actions.
    • The transition from real-time to memory-based control occurs when visual feedback is lost.