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Hands-on adaptation: Bodily stimuli increase size adaptation aftereffect.

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Visual perception of hands is more susceptible to size illusions than abstract shapes. This suggests that the identity and meaning of stimuli influence how we perceive size after adaptation.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • The size adaptation aftereffect demonstrates how prior exposure to stimuli alters current size perception.
  • Biological significance may confer unique properties to body part size processing, but susceptibility to illusions remains unclear.

Purpose of the Study:

  • To investigate if visual stimuli of body parts (hands) are more prone to size adaptation aftereffects than nonbody stimuli (abstract shapes).
  • To explore the influence of stimulus identity and meaning on perceptual aftereffects.

Main Methods:

  • The Uznadze illusion (size-contrast adaptation aftereffect) was induced in three experiments.
  • Participants were exposed to pairs of hands or abstract shapes of differing sizes.
  • Following adaptation, participants judged the size of new stimuli.

Main Results:

  • A stronger size adaptation aftereffect was observed for hand stimuli compared to nonhand stimuli in Experiments 1 and 2.
  • Experiment 3 confirmed a stronger adaptation for hands, particularly when nonhand stimuli were processed first, suggesting context-dependent effects.

Conclusions:

  • Visual hand stimuli exhibit heightened susceptibility to size adaptation.
  • The identity and attributed meaning of a stimulus play a significant role in modulating perceptual aftereffects, impacting visual processing.