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Integrating Visual Psychophysical Assays within a Y-Maze to Isolate the Role that Visual Features Play in Navigational Decisions

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Lightness, brightness, and anchoring.

Barton L Anderson¹, Michael Whitbread¹, Chamila de Silva²

¹School of Psychology, University of Sydney, Sydney, Australia.

Journal of Vision

|August 9, 2014

Summary

This summary is machine-generated.

Lightness perception research often uses 2D surfaces, but this study found no fixed "anchor" for perceived lightness. Instead, perceived lightness on these surfaces directly reflects brightness, even in dim light.

Keywords:

anchoring color constancy lightness surface perception

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Area of Science:

Visual perception
Psychophysics
Computational neuroscience

Background:

Lightness perception studies typically use flat, matte, 2D surfaces.
The light reaching the eye mixes illuminant and surface properties, creating ambiguity.
A proposed "anchoring rule" suggests the highest luminance is fixed as "white" in lightness perception.

Purpose of the Study:

To test the "anchoring rule" hypothesis in lightness perception.
To investigate how the visual system maps luminance to lightness under ambiguous conditions.
To examine lightness perception in low-contrast images under dim illumination.

Main Methods:

Conducted experiments using 2D Mondrian displays.
Varied luminance contrast and illumination levels.
Measured the perceived lightness of different luminance values within the displays.

Main Results:

Perceived lightness of the highest luminance varied monotonically with its brightness.
This scaling effect was also observed for the lowest luminance values.
Computational ambiguity in mapping luminance to lightness is reflected in perceptual experience.

Conclusions:

No evidence supports a fixed "anchoring rule" in lightness perception for 2D displays.
The conflation of brightness and lightness in 2D displays is perceptually relevant.
Perceived lightness on 2D surfaces is not rigidly anchored but scales with brightness.