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      Human speed perception is contrast dependent

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      Vision Research
      Elsevier BV

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          Abstract

          When two parallel gratings moving at the same speed are presented simultaneously, the lower-contrast grating appears slower. This misperception is evident across a wide range of contrasts (2.5-50%) and does not appear to saturate (e.g. a 50% contrast grating appears slower than a 70% contrast grating moving at the same speed). On average, a 70% contrast grating must be slowed by 35% to match a 10% contrast grating moving at 2 degrees/sec (N = 6). Furthermore, the effect is largely independent of the absolute contrast level and is a quasi-linear function of log contrast ratio. A preliminary parametric study shows that, although spatial frequency has little effect, relative orientation is important. Finally, the misperception of relative speed appears lessened when the stimuli to be matched are presented sequentially.

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          Author and article information

          Journal
          Vision Research
          Vision Research
          Elsevier BV
          00426989
          August 1992
          August 1992
          : 32
          : 8
          : 1535-1549
          Article
          10.1016/0042-6989(92)90209-2
          1455726
          05093dae-385f-4382-b651-d93d75927d7a
          © 1992

          https://www.elsevier.com/tdm/userlicense/1.0/

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