Dynamical approach to inhomogeneous rays

Sam L. Robinson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We have simultaneously measured detection and temporal frequency identification for both red–green isoluminant and achromatic stimuli over a range of temporal frequencies for two observers. Results show that temporal frequency identification can be made along the temporal frequency dimension for both red–green and achromatic stimuli at contrasts close to detection threshold. In general, temporal frequency identification was better for the achromatic than for the red–green stimuli; however, the level of chromatic identification performance was still sufficient to permit us to reject the notion that the red–green mechanism embodies a single temporal filter. We have developed a model based on signal detection theory that assumes that detection and identification both depend on the properties of the temporal filters underlying each mechanism. From this we have derived putative underlying shapes and sensitivities for the temporal filters of the red–green and achromatic mechanisms that comprise a low-pass and a bandpass filter for red–green color vision and two bandpass filters for luminance vision. Finally, we suggest that the relative perceived slowing of isoluminant stimuli may be accounted for by a common motion analysis subserved by different front-end temporal filters for red–green and achromatic motion signals.

Original languageEnglish (US)
Pages (from-to)2021-2026
Number of pages6
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number10
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition


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