- Mach bands
Mach bands are an
optical illusionconsisting of an image of two wide bands, one light and one dark, separated by a narrow strip with a light-to-dark gradient. The human eyeperceives two narrow bands of different brightnesses either side of the gradient that are not present in the original image. The illusion is named after Ernst Mach.
The effect is like that of a spatial high-boost filter. It is usually supposed that it is caused by
lateral inhibitionof the receptors in the eye. An alternative explanation is that visual perception, using a fundamentally statistical strategy, represents the common occurrence of highlights and lowlights in association with luminance gradients.
Eagleman, DM (2001) Visual Illusions and Neurobiology. Nature Reviews Neuroscience. 2(12): 920-6.
* [http://www.nist.gov/lispix/imlab/illusions/machband.html Demonstration of the Mach band]
* [http://www.purveslab.net/ Laboratory of Dale Purves, MD]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Mach bands — Also known as Mach s bands and Mach band illusion. All three eponyms refer to the Czech born Austrian physicist and philosopher Ernst Mach (1838 1916), who first described the concomitant phenomenon in 1865. They refer to a contrast illusion… … Dictionary of Hallucinations
Mach — may refer to:* Mach number, a measure of speed * Gillette Mach3, a manual razor with three blades * Mach bands, an optical illusion * Muscarinic acetylcholine receptor, abbreviated mACh In computers* ATI Mach, a 2D GPU chip by ATI * Mach II, an… … Wikipedia
Mach effect — The Mach Effect can refer to one of the following two things:Mach bands are an optical illusion that are often referred to also as the mach effect .The Woodward effect is a physics related propulsion phenomenon, also commonly referred to also as… … Wikipedia
Mach band illusion — see Mach bands … Dictionary of Hallucinations
Mach, Ernst — born Feb. 18, 1838, Chirlitz Turas, Moravia died Feb. 19, 1916, Haar, Ger. Austrian physicist and philosopher. After earning a doctorate in physics in 1860, he taught at the Universities of Vienna and Graz as well as Charles University in Prague … Universalium
Mach One (band) — Infobox musical artist Name = Mach One Img capt = Img size = Landscape = Background = group or band Birth name = Alias = Born = Died = Origin = England Instrument = Voice type = Genre = Neo progressive rock Occupation = Years active = 1980… … Wikipedia
Mach Pelican — Infobox musical artist Name = Mach Pelican Img capt = Background = group or band Origin = Perth, Western Australia, Australia Genre = Punk rock Years active = 1996 ndash;2007 Label = Shock Records Stomp Entertainment Bop Records URL = [http://www … Wikipedia
Ernst Mach — Infobox Philosopher region = Western Philosophy era = 20th century philosophy color = lightsteelblue image size = 200px image caption = Ernst Mach name = Ernst Mach birth = February 18, 1838 Brno, Austrian Empire death = Death date and… … Wikipedia
Bandas de Mach — Saltar a navegación, búsqueda Las bandas de Mach son una ilusión óptica que parte de una imagen con dos bandas, una iluminada y la otra oscura, separadas por una estrecha banda central coloreada con un gradiente de iluminado a oscuro. El ojo… … Wikipedia Español
Optical illusion — This article is about visual perception. For the Time Requiem album, see Optical Illusion (album). An optical illusion. The square A is exactly the same shade of gray as square B. See checker shadow illusion. An optical illusion (also called a… … Wikipedia