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Related Experiment Videos

Action without perception in human vision.

Melvyn A Goodale1

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

Cognitive Neuropsychology
|July 9, 2008
PubMed
Summary
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The dorsal and ventral visual streams process action and perception separately, with actions often unaffected by visual illusions that alter perception. Understanding their interaction is key to visually guided behavior.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Primate Visual System

Background:

  • The primate visual system is divided into dorsal and ventral streams.
  • The dorsal stream controls action, while the ventral stream constructs visual perception.
  • Evidence from neuroimaging, neuropsychology, and neurophysiology supports this distinction.

Purpose of the Study:

  • To investigate the functional differences between the dorsal and ventral visual streams.
  • To examine how pictorial illusions affect vision for action versus vision for perception.
  • To explore the interaction between these two visual processing streams.

Main Methods:

  • Human psychophysical experiments measuring timing and spatial metrics of vision for action and perception.
  • Analysis of how actions like grasping and reaching are affected by pictorial illusions.

Related Experiment Videos

  • Review of neuroimaging, neuropsychology, and monkey neurophysiology studies.

    • Main Results:

    • Actions, particularly practiced ones, are often unaffected by high-level pictorial illusions that distort perception.
    • Specific conditions (practiced actions, right hand, real-time visible targets) are necessary for actions to escape illusion effects.
    • Behavioral evidence suggests distinct timing, metrics, and frames of reference for the two streams.

    Conclusions:

    • The dorsal and ventral streams utilize different processing strategies for action and perception.
    • Despite differences, there is seamless interaction between the streams for adaptive behavior.
    • Further research is needed to elucidate the information exchange between these visual pathways.