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Related Experiment Video

Updated: May 10, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Optimal sampling of visual information for lightness judgments.

Matteo Toscani¹, Matteo Valsecchi, Karl R Gegenfurtner

¹Department of Psychology, Justus Liebig University Giessen, D-35394 Giessen, Germany.

Proceedings of the National Academy of Sciences of the United States of America

|June 19, 2013

Summary

Our visual system uses eye movements to judge surface lightness. Focusing on brighter areas of an object causally influences how we perceive its overall lightness, improving accuracy.

Keywords:

attention lightness constancy lightness perception visual perception

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Area of Science:

Visual perception
Cognitive neuroscience
Human visual system

Background:

The human visual system has limited processing capacity and resolution.
Eye movements and attention are crucial for visual sampling.
Perception of surface attributes like lightness is complex.

Purpose of the Study:

To investigate how eye fixation location influences lightness perception.
To determine if there is a causal link between fixation luminance and lightness judgments.
To understand the visual system's heuristic for invariant lightness perception.

Main Methods:

Participants matched the lightness of natural objects.
Gaze-contingent display setup was used to control fixation points.
Simulations of physical lighting were performed.

Main Results:

Observers fixated on brighter regions of objects when judging color.
Lightness matches were higher when participants fixated brighter regions.
Fixating bright areas causally increased perceived lightness.

Conclusions:

Fixation location significantly modulates lightness perception.
The visual system employs an efficient heuristic by sampling bright regions.
This strategy aids in accurate and invariant judgments of object lightness.