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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

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Published on: June 3, 2013

Amodal completion is modulated by lightness similarity.

Juno Kim¹, Kelly Jeng, Barton L Anderson

¹School of Psychology, University of Sydney, Sydney, New South Wales, 2006, Australia, juno@psych.usyd.edu.au.

Attention, Perception & Psychophysics

|September 18, 2013

Summary

Amodal completion, the perception of hidden object parts, relies on surface lightness similarity. This study demonstrates that perceived lightness, not just luminance, drives amodal completion, impacting visual perception.

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Area of Science:

Visual Perception
Cognitive Psychology
Computational Neuroscience

Background:

Amodal completion is influenced by contour and global shape.
Previous research suggests surface similarity impacts amodal completion, but the role of lightness constancy remains unclear.

Purpose of the Study:

To investigate whether amodal completion depends on processes occurring before or after lightness constancy is established.
To determine the relative importance of luminance versus lightness similarity in amodal completion.

Main Methods:

Utilized computer rendering to manipulate cast shadows and surface luminance/lightness.
Employed amodal completion tasks and apparent-motion tasks to assess perceptual grouping and completion strength.

Main Results:

Perceived completion was sensitive to the consistency between surface luminance decrements and cast shadow orientation.
Amodal completion strength was primarily driven by perceived surface reflectance (lightness similarity), not just luminance matching.
Matching surfaces by lightness significantly improved apparent motion perception compared to contrast matching.

Conclusions:

Amodal completion is critically dependent on the perceived similarity in lightness between surface fragments.
These findings suggest that lightness constancy plays a crucial role in the processes underlying amodal completion.