Motion capture of luminance stimuli by equiluminous color gratings and by attentive tracking

  • Culham J
  • Cavanagh P
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Two experiments demonstrated motion capture of luminance-defined dots by gratings with no net luminance-based motion. In a series of two-frame experimental trials, we superimposed bright dots and a color grating rotating in opposite directions. Capture was observed at equiluminance and was facilitated by the presence of color in gratings over a range of luminance contrasts. In a second experiment, observers noted that when a counterphase grating was tracked in either direction with attention, the superimposed dots were captured in that direction. These results suggest motion capture is supported not only by luminance-based motion, but also by color- and attention-based motion. Indeed, we suggest that the most parsimonious explanation is that all capture is mediated by attention. © 1994.

Author-supplied keywords

  • Attentive tracking
  • Color
  • Equiluminance
  • Luminance
  • Motion capture

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  • Jody C. Culham

  • Patrick Cavanagh

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