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Zeitschriftenartikel

Real and virtual borders in the Poggendorff illusion

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons84306

Wehrhahn,  C
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Zitation

Westheimer, G., & Wehrhahn, C. (1997). Real and virtual borders in the Poggendorff illusion. Perception, 26(2), 1495-1502. doi:10.1068/p261495.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-EA6E-E
Zusammenfassung
The strength of the Poggendorff illusion has been determined by a nulling method for the classical as well as other configurations of the central inducing region. Compared to a uniform field, an inducing rectangle with very low contrast produces a marked illusion, which saturates at a Michelson contrast of about 0.1. With virtual borders of the Kanizsa type there is a weak illusion and this effect is attenuated when the 'pacman' sectors are occluded. Texture borders without luminance contrast induce a stronger illusion. These results are discussed in relation to earlier data for contrast dependence of Vernier acuity and for the orientation discrimination and tilt illusion with real and virtual borders.