Poggendorff illusion

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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.[1]

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.

[edit] References

  1. ^ Zöllner F (1860). "Ueber eine neue Art von Pseudoskopie und ihre Beziehungen zu den von Plateau und Oppel beschrieben Bewegungsphaenomenen". Annalen der Physik 186: 500-25. doi:10.1002/andp.18601860712. 
  • Westheimer G, Wehrhahn C. (1997). "Real and virtual borders in the Poggendorff illusion". Perception 26 (12): 1495-501. doi:10.1068/p261495. 
  • Greist-Bousquet S., Schiffman H. R. (1981). "The Poggendorff illusion: an illusion of linear extent?". Perception 10 (2): 155-64. doi:10.1068/p100155. 
  • The Poggendorff Illusion as a Constancy Phenomenon (1963). "Green R. T., Hoyle E. M.". Nature 200: 611 - 612. doi:10.1038/200611a0. 
  • M. J. Morgan (1999). "The Poggendorff illusion: a bias in the estimation of the orientation of virtual lines by second-stage filters". Vision Research 39 (14): 2361-2380. doi:10.1016/S0042-6989(98)00243-0. 
  • R. L. Gregory (1968). "Perceptual Illusions and Brain Models". Proceedings of the Royal Society of London Series B 171 (1024): 279-296. 
  • Day, R. H. (1973). "The oblique line illusion: The poggendorff effect without parallels". The Quarterly Journal of Experimental Psychology 25 (4): 535 - 541. doi:10.1080/14640747308400375. 
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