An empirical basis for Mach bands.

Abstract:

:Mach bands, the illusory brightness maxima and minima perceived at the initiation and termination of luminance gradients, respectively, are generally considered a direct perceptual manifestation of lateral inhibitory interactions among retinal or other lower order visual neurons. Here we examine an alternative explanation, namely that Mach bands arise as a consequence of real-world luminance gradients. In this first of two companion papers, we analyze the natural sources of luminance gradients, demonstrating that real-world gradients arising from curved surfaces are ordinarily adorned by photometric highlights and lowlights in the position of the illusory bands. The prevalence of such gradients provides an empirical basis for the generation of this perceptual phenomenon.

authors

Lotto RB,Williams SM,Purves D

doi

10.1073/pnas.96.9.5239

keywords:

subject

Has Abstract

pub_date

1999-04-27 00:00:00

pages

5239-44

issue

9

eissn

0027-8424

issn

1091-6490

journal_volume

96

pub_type

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