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An empirical basis for Mach bands.

R B Lotto¹, S M Williams, D Purves

¹Department of Neurobiology, Box 3209, Duke University Medical Center, Durham, NC 27710, USA.

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

|April 29, 1999

Summary

Mach bands, illusory visual effects, may arise from real-world luminance gradients, not just neural inhibition. This study finds natural photometric highlights and lowlights on curved surfaces mimic these perceptual phenomena.

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Area of Science:

Visual perception
Neuroscience
Computational vision

Background:

Mach bands are illusory brightness variations at luminance gradient edges.
They are typically explained by lateral inhibition in early visual processing.

Purpose of the Study:

To investigate an alternative explanation for Mach bands.
To explore if real-world luminance gradients can generate Mach band perception.

Main Methods:

Analysis of natural sources of luminance gradients.
Examination of photometric properties of curved surfaces in natural scenes.

Main Results:

Real-world luminance gradients, particularly from curved surfaces, often feature photometric highlights and lowlights.

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These natural features spatially correspond to the locations of illusory Mach bands.

Conclusions:

The physical properties of natural luminance gradients offer a plausible explanation for Mach bands.
Perception of Mach bands may be an interpretation of environmental optical phenomena rather than solely neural processing.