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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Action can amplify motion-induced illusory displacement.

Franck Caniard1, Heinrich H Bülthoff2, Ian M Thornton3

  • 1Max Planck Institute for Biological Cybernetics Tübingen, Germany.

Frontiers in Human Neuroscience
|January 29, 2015
PubMed
Summary
This summary is machine-generated.

Illusory displacement from local motion is stronger during active control than passive viewing. This visual illusion impacts the perception-action cycle, affecting how we interact with moving objects.

Keywords:
active visionclosed-loop controlgame psychophysicslocal-global motionmobile devicesmotion illusionsmotion-induced position shiftsperception-action

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Area of Science:

  • Visual perception
  • Human-computer interaction
  • Cognitive psychology

Background:

  • Local motion creates illusory displacement of static objects.
  • Previous research showed active control doesn't eliminate this illusion.

Purpose of the Study:

  • To directly compare illusory displacement magnitude under active versus passive conditions.
  • To investigate the influence of active control on visual illusions.

Main Methods:

  • Participants actively controlled a Gabor patch on an iPad slalom course.
  • A two-alternative forced-choice task assessed judgments under passive viewing.
  • Point of subjective equality (PSE) was extracted from cumulative normal functions.

Main Results:

  • Illusory displacement was significantly larger under active conditions compared to passive.
  • Control conditions confirmed results were not due to motor control or trajectory differences.
  • Performance estimates were equivalent in both conditions without local motion.

Conclusions:

  • The visual illusion penetrates multiple levels of the perception-action cycle.
  • Active vision plays a crucial role in the experience of perceptual illusions.
  • Future research should explore illusions within active vision contexts.