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Related Concept Videos

Perceptual Constancy01:12

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Crossmodal Texture Perception Is Illumination-Dependent.

Karina Kangur1, Martin Giesel1, Julie M Harris2

  • 1The School of Psychology, University of Aberdeen, Aberdeen, AB24 3FX, UK.

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Summary
This summary is machine-generated.

Visual perception of surface roughness changes with lighting. This study shows that this illumination-dependent roughness perception transfers to crossmodal judgments, impacting tactile and visual assessments.

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Area of Science:

  • Psychology
  • Neuroscience
  • Perception

Background:

  • Visual perception of 3D texture roughness is known to vary with illumination direction.
  • This phenomenon, a lack of roughness constancy, leads to surfaces appearing rougher under lower angles of light.
  • It remains unclear if the visual system can access illumination-invariant features for roughness judgment or if it relies on illumination-dependent cues.

Purpose of the Study:

  • To investigate if the visual system relies on illumination-dependent features for roughness judgment in crossmodal tasks.
  • To determine if the visual system can access illumination-invariant surface features evaluated by the tactile system.
  • To examine the transfer of illumination-dependent visual roughness perception to crossmodal matching.

Main Methods:

  • Participants (N=32) explored abrasive paper tactually or visually under top and oblique illumination.
  • They performed intramodal (same modality) and crossmodal (different modality) matching tasks.
  • Comparison stimuli varied in physical roughness to assess perceived roughness.

Main Results:

  • Intramodal matching performance was consistent across modalities and illumination conditions.
  • In crossmodal tasks, visual exploration under oblique light led to selecting rougher tactile matches compared to top light.
  • Tactile exploration under oblique light resulted in selecting smoother visual matches compared to top light.

Conclusions:

  • Visual roughness perception is dependent on illumination direction, confirming a lack of roughness constancy.
  • This failure of roughness constancy significantly transfers to crossmodal judgments.
  • The findings highlight the influence of illumination cues on crossmodal texture perception.