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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Motor Control

Background:

  • Visually guided actions may be less susceptible to certain size illusions.
  • Previous research indicated reduced illusion magnitudes in action components.

Purpose of the Study:

  • To investigate if reduced illusion magnitudes in action components extend to conscious perceptual judgments.
  • To characterize how visual size perception is altered by size-mediated behaviors.

Main Methods:

  • Participants judged target sizes verbally or by reaching to grasp/touch.
  • Visual illusions were induced using contextual elements (e.g., Ebbinghaus illusion).
  • Illusion magnitudes were compared across verbal and action-oriented tasks.

Main Results:

  • Illusion magnitudes were significantly smaller when participants performed or imagined actions.
  • This reduction in illusion magnitude persisted after returning to verbal judgments.
  • A motor interference task abolished the illusion reduction effect.

Conclusions:

  • Engaging in or imagining actions alters visual size perception, reducing illusion susceptibility.
  • Visual processing shifts associated with action persist beyond the motor task.
  • Motor interference suggests a link between motor preparation and illusion magnitude reduction.