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Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards
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The "Spinner" Illusion: More Dots, More Speed?

Hiroshi Ashida1, Alan Ho2, Akiyoshi Kitaoka3

  • 1Kyoto University, Kyoto, Japan.

I-Perception
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PubMed
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Human speed perception is influenced by spatial frequency (SF). Higher SFs lead to overestimations of speed, while lower SFs cause underestimations, a phenomenon observed in visual motion perception.

Keywords:
psychophysicsspeed perceptionvisual illusionvisual motion

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Area of Science:

  • Visual Perception
  • Human Factors
  • Psychophysics

Background:

  • The 'spinner effect' describes how perceived speed of rotating dots increases with dot density.
  • Previous research (Ho & Anstis, 2013) highlighted this illusion, but the underlying mechanisms require further investigation.
  • Understanding visual system's response to spatial and temporal frequencies is crucial for explaining motion perception.

Purpose of the Study:

  • To quantify the 'spinner effect' using radial sinusoidal gratings.
  • To investigate the influence of spatial frequency (SF) on perceived angular speed.
  • To explore the relationship between SF, temporal frequency, and human speed perception.

Main Methods:

  • A two-alternative forced-choice (2AFC) procedure was employed.
  • Participants compared the perceived speed of rotating radial gratings with varying SFs against a reference stimulus.
  • Stimuli included radial and linear sinusoidal gratings presented at different angular speeds.

Main Results:

  • Perceived angular speed was overestimated for higher radial SFs and underestimated for lower SFs relative to a 4 c/rev reference.
  • The magnitude of the spinner effect increased with SF but rapidly saturated.
  • Similar SF-dependent biases in perceived speed were observed with translating linear gratings.

Conclusions:

  • Human speed perception is biased by temporal frequency, which increases with SF at constant physical speed.
  • The findings support the hypothesis that temporal frequency plays a key role in SF-dependent speed perception.
  • Increased density of visual elements (dots or lines) moving coherently enhances perceived speed.