Hess afterimage
   The eponym Hess afterimage refers to the German ophthalmologist Carl von Hess (1863-1923). It is used to denote a "positive afterimage that appears third in a temporal sequence of " afterimages resulting from a brief light stimulus. Hess afterimages have the same relative brightness relations as the primary optical stimulus. The term is used in opposition to "Hering's afterimage (the first in the temporal sequence of afterimages), and " Purkinje afterimage (the second in this sequence). The Hess afterimage can also be classified as a "physiological illusion.
   References
   Brown, J.L. (1965). Afterimages.In: Vision and visual perception. Edited by Graham, C.H. New York, NY: John Wiley & Sons.

Dictionary of Hallucinations. . 2010.

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  • afterimage —    Also referred to as aftersensation, afterimagery, and post image. All three terms are used to denote a group of visual percepts that occur in response to a primary light stimulus to the eye, typically noticed after the stimulus has been… …   Dictionary of Hallucinations

  • hess image — ˈhes noun Usage: usually capitalized H Etymology: after Carl von Hess died 1923 German ophthalmologist : a third positive afterimage in a succession of visual afterimages resulting from a brief light stimulus …   Useful english dictionary

  • positive afterimage —    A term used to denote an afterimage that has the same relative brightness relations as the primary optical stimulus (for example, a dark blue afterimage of a dark blue pen). The term positive afterimage is used in opposition to the term *… …   Dictionary of Hallucinations

  • Hering's afterimage —    The eponym Hering s afterimage refers to the German psychologist and physiologist Karl Ewald Konstantin Hering (1834 1918). It is used to denote a positive afterimage that appears first in a temporal sequence of afterimages resulting from a… …   Dictionary of Hallucinations

  • Purkinje afterimage —    Also referred to as Purkinje image and Bidwell s ghost. The eponym Purkinje afterimage refers to the Bohemian physiologist Johannes Evange lista Purkyne (1787 1869). It is used to denote a negative afterimage that appears secondly in a… …   Dictionary of Hallucinations

  • Susan Sontag — Infobox Writer name = Susan Sontag |thumb|right imagesize = 200px caption = pseudonym = birthdate = Birth date|1933|1|16|mf=y birthplace = New York City, New York deathdate = Death date and age|2004|12|28|1933|1|16|mf=y deathplace = New York City …   Wikipedia

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