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Paper   IPM / Cognitive / 7467
School of Cognitive Sciences
  Title:   Motion induced overestimation of the number of items in a display
1.  S.R. Afraz
2.  M. Vaziri pashkam
3.  R. Kiani
4.  H. Esteky
  Status:   Published
  Journal: Perception
  No.:  8
  Vol.:  33
  Year:  2004
  Pages:   915-925
  Supported by:  IPM
Subjects were asked to report the number of items in a display as the items moved along a circular path around the fixation point. As the rotation speed increased, the apparent number of items also increased. This Motion Induced Overestimation (MIO) effect was investigated in three 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 third experiment, using an adjustment paradigm, we measured the speed threshold of MIO effect onset. Temporal rate of the display, which was defined as product of rotation speed and the number of rotating items, was the determining factor of MIO onset. In the third experiment, moving items were marked with different colors. Surprisingly, the number of perceived items was still overestimated even though the number of perceived colors was not.

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