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Related Experiment Videos

Matching boxes: familiar size influences action programming.

Robert D McIntosh1, Gavin Lashley

  • 1Human Cognitive Neuroscience, University of Edinburgh, 7 George Square, Edinburgh EH8 9JZ, UK. r.d.mcintosh@ed.ac.uk

Neuropsychologia
|April 15, 2008
PubMed
Summary
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Object recognition influences how we reach for items. Familiar object size impacts reach amplitude and hand shaping, challenging the perception/action model of visual processing.

Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Motor Control

Background:

  • The perception/action model posits that visually guided actions rely on bottom-up spatial information, separate from object recognition.
  • This model suggests that object knowledge does not influence the programming of goal-directed movements.

Purpose of the Study:

  • To investigate whether perceptual recognition and object knowledge influence action programming in the human visual pathway.
  • To challenge the strict separation of perception and action proposed by the dominant model.

Main Methods:

  • Participants reached to grasp familiar objects (matchboxes) with known sizes.
  • Reach amplitude and hand pre-shaping were measured.
  • Binocular vision cues were available to provide spatial information.

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Main Results:

  • The expected size of familiar objects significantly affected reach amplitude.
  • Object size also influenced the pre-shaping of the hand during the reach.
  • These effects occurred even when binocular cues were available for spatial guidance.

Conclusions:

  • Perceptual recognition and knowledge of object properties routinely influence action programming.
  • The findings challenge the traditional perception/action model by demonstrating the integration of object knowledge into motor control.
  • Visual perception and action are more intertwined than previously suggested by dominant models.