Poggendorff illusion

Poggendorff illusion

The Poggendorff Illusion is an optical illusion that involves the brain's perception of the interaction between diagonal lines and horizontal and vertical edges. It is named after Poggendorff, who discovered it in the drawing of Johann Karl Friedrich Zöllner, in which Zöllner showed the Zöllner illusion in 1860. [cite journal
title = Ueber eine neue Art von Pseudoskopie und ihre Beziehungen zu den von Plateau und Oppel beschrieben Bewegungsphaenomenen
author = Zöllner F
journal = Annalen der Physik
volume = 186
issue =
pages = 500–25
year = 1860
url = http://gallica.bnf.fr/ark:/12148/bpt6k151955/f512.table
doi = 10.1002/andp.18601860712 ]

In the picture to the right, a straight black and red line is obscured by a grey rectangle. The blue line appears, instead of the red line, to be the same as the black one, which is clearly shown not to be the case on the second picture.

References

*cite journal
title = Real and virtual borders in the Poggendorff illusion
author = Westheimer G, Wehrhahn C.
journal = Perception
volume = 26
issue = 12
pages = 1495–501
year = 1997
url =
doi = 10.1068/p261495
*cite journal
title = The Poggendorff illusion: an illusion of linear extent?
author = Greist-Bousquet S., Schiffman H. R.
journal = Perception
volume = 10
issue = 2
pages = 155–64
year = 1981
url =
doi = 10.1068/p100155
*cite journal
title = Green R. T., Hoyle E. M
author = The Poggendorff Illusion as a Constancy Phenomenon
journal = Nature
volume = 200
pages = 611–612
year = 1963
url =
doi = 10.1038/200611a0
*cite journal
title = The Poggendorff illusion: a bias in the estimation of the orientation of virtual lines by second-stage filters
author = M. J. Morgan
journal = Vision Research
volume = 39
issue = 14
pages = 2361–2380
year = 1999
url =
doi = 10.1016/S0042-6989(98)00243-0
*cite journal
title = Perceptual Illusions and Brain Models
author = R. L. Gregory
journal = Proceedings of the Royal Society of London Series B
volume = 171
issue = 1024
pages = 279–296
year = 1968
url = http://links.jstor.org/sici?sici=0080-4649%2819681213%29171%3A1024%3C279%3APIABM%3E2.0.CO%3B2-U
doi =
*cite journal
title = The oblique line illusion: The poggendorff effect without parallels
author = Day, R. H.
journal = The Quarterly Journal of Experimental Psychology
volume = 25
issue = 4
pages = 535–541
year = 1973
url =
doi = 10.1080/14640747308400375


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  • poggendorff illusion — ˈpägənˌdȯrf noun Usage: usually capitalized P Etymology: after Johann C. Poggendorff died 1877 German physicist : an apparent deflection of a straight line when it is interrupted by two lines parallel to each other …   Useful english dictionary

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  • Johann Christian Poggendorff — (December 29, 1796 January 24, 1877), German physicist, was born in Hamburg.IntroductionPoggendorff was a physicist of high (although not of the very highest) rank. He was wanting in mathematical ability but was an able and conscientious… …   Wikipedia

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