Cite as:
Vaziri-Pashkam M, Afraz S R, Kiani R, Esteky H, 2004, "Motion-induced overestimation" Perception 33 ECVP Abstract Supplement

Motion-induced overestimation

M Vaziri-Pashkam, S R Afraz, R Kiani, H Esteky

Subjects were asked to report the number of items in a display as the items moved along a circular path around a fixation point. As the rotation speed increased, the reported number of items also increased. This motion-induced overestimation (MIO) illusion was investigated in two experiments. In the first experiment, the effect of rotation speed and set size was explored with an enumeration task. The overestimation error increased with an increase in speed or number of items in the display. In the second experiment, using an adjustment paradigm, we measured the speed threshold of the onset of the MIO effect. The temporal rate of the display, which was defined as a product of the rotation speed and the number of rotating items, was the determining factor of the onset of MIO.

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