Mach bands

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 that can be perceived in two or more adjacent fields with different hues, interconnected by a colour gradient. This contrast illusion consists of darker and brighter bands bordering the edges of the colour gradient, lending the edge of the light field an even lighter appearance and the edge of the dark field an even darker appearance. Although the mediation of Mach bands is not fully understood, an important role is attributed to reciprocal lateral inhibition by adjacent cones in the retina. As a consequence, Mach bands are commonly classified as *entoptic phenomena. Because their occurrence is bound up with the inherent properties of the perceptual system, they can also be classified as "physiological illusions. Mach bands should not be confused with a related contrast illusion called the "Cornsweet effect.
   Lotto, R.B., Williams, S.M., Purves, D. (1999). Mach bands as empirically derived associations. Proceedings of the National Academy of Sciences of the United States of America, 96, 5245-5250.
   Mach, E. (1865). Über die Wirkung der räumlichen Verteilung des Lichtreizes auf die Netzhaut. Sitzungsberichte der mathematischnaturwissenschaftlichen Classe der kaiserlichen Akademie der Wissenschaften, 52, 303-322.

Dictionary of Hallucinations. . 2010.

Нужна курсовая?

Look at other dictionaries:

  • Mach bands — are an optical illusion consisting 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 eye perceives two narrow bands of different brightnesses either side of the gradient… …   Wikipedia

  • 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”