Mach bands - definition of Mach bands by The Free Dictionary
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Mach bands (mäk)
Illusory bands of intensified lightness and darkness perceived adjacent to the borders of light and dark in a visual image, caused by image processing in the retina and optic nerve.
[After Ernst Machwho discovered them.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive
Observational astronomy is rife with examples of these "Mach bands
," notably the "Terby White Spot," a spurious bright feature often seen bordering the intensely black shadow cast by Saturn's globe across the planet's rings (S&T: May 2014, p.
He also became interested in optical illusions, which led to his identification of what came to be called Mach bands
. The story is told in a conversational tone with occasional philosophical asides from the authors.
represent a special form of brightness contrast occurring at borders of adjacent visual stimuli differing in luminance (reviewed in Fiorentini, 1972).