Motion streaks do not influence the perceived position of stationary flashed objects

Pavan, Andrea and Bellacosa Marotti, Rosilari (2012) Motion streaks do not influence the perceived position of stationary flashed objects. Scientific World Journal, 2012 . p. 909547. ISSN 2356-6140

Full content URL: http://dx.doi.org/10.1100/2012/909547

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Abstract

In the present study, we investigated whether motion streaks, produced by fast moving dots Geisler 1999, distort the positional map of stationary flashed objects producing the well-known motion-induced position shift illusion (MIPS). The illusion relies on motion-processing mechanisms that induce local distortions in the positional map of the stimulus which is derived by shape-processing mechanisms. To measure the MIPS, two horizontally offset Gaussian blobs, placed above and below a central fixation point, were flashed over two fields of dots moving in opposite directions. Subjects judged the position of the top Gaussian blob relative to the bottom one. The results showed that neither fast (motion streaks) nor slow moving dots influenced the perceived spatial position of the stationary flashed objects, suggesting that background motion does not interact with the shape-processing mechanisms involved in MIPS.

Keywords:Motion streaks, Motion-induced position shift
Subjects:C Biological Sciences > C800 Psychology
C Biological Sciences > C830 Experimental Psychology
Divisions:College of Social Science > School of Psychology
ID Code:16317
Deposited On:22 Dec 2014 16:48

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