Mach bands

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Mach bands

 (mäk)
pl.n.
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.]
References in periodicals archive ?
It is also been shown by Hsiao (1973) that moths are at first attracted towards the light, but as they approach the source, they actually then try to avoid its effects and end up flying around the lamp at a fixed distance (usually 20-30 cm) within a perceived dark area known as the Mach band.
local time, we started to notice the thin, dark, hazy layer--the Mach band or black-drop effect--between the limbs of Venus and the Sun.
He also became interested in optical illusions, which led to his identification of what came to be called Mach bands.
That is, no study has yet tested for the presence of Mach bands in either modality.