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Planning versus online control: dynamic illusion effects in grasping?

Volker H Franz1

  • 1Max Planck Institut für Biologische Kybernetik, Spemannstrasse 38, 72076 Tübingen, Germany. volker.franz@tuebingen.mpg.de

Spatial Vision
|July 16, 2003
PubMed
Summary

Grasping an object is not solely planned early on; visual illusions affecting perceived size remain constant throughout the action. This challenges the traditional planning/control model of action execution.

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Visual Perception

Background:

  • The planning/control model posits that action execution, like grasping, is primarily influenced by contextual information during the initial planning phase.
  • This model predicts that context-induced visual illusions, such as the Ebbinghaus illusion, should have diminishing effects as a movement progresses into the control phase.

Purpose of the Study:

  • To investigate whether the influence of the Ebbinghaus illusion on grasping behavior decreases over the course of the movement.
  • To test the validity of the planning/control model's predictions regarding the temporal dynamics of contextual influences on action.

Main Methods:

  • Reanalysis of a dataset (N=26) examining human grasping movements.
  • Participants performed grasping actions towards objects presented within the context of the Ebbinghaus illusion.

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Main Results:

  • The magnitude of the Ebbinghaus illusion's effect on grasping did not diminish over the time course of the movement.
  • Illusion effects remained consistently strong throughout the entire grasping action, from initiation to completion.

Conclusions:

  • The findings contradict the planning/control model's assumption that contextual influences are limited to the early planning stages of action.
  • Motor control during grasping appears to be continuously sensitive to visual context, suggesting a more integrated process than previously modeled.