November 2002
Volume 2, Issue 7
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Polarity-specific masking of isoluminant colors
Author Affiliations
  • Dirk Beer
    University of California San Diego
Journal of Vision November 2002, Vol.2, 546. doi:
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      Dirk Beer, Mark Becker, Stuart Anstis, Don MacLeod; Polarity-specific masking of isoluminant colors. Journal of Vision 2002;2(7):546.

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      © ARVO (1962-2015); The Authors (2016-present)

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Adaptation can be specific for chromatic polarity. For example, adapting to isoluminant red spots on a gray background reduces the vividness of subsequently viewed red spots more than that of green spots (Beer and MacLeod, ARVO 2000). Becker and Anstis (OSA-UCI 2001) have demonstrated a dramatic, complete polarity specificity for luminance metacontrast masking of a spot by a ring: white rings mask white spots and black rings mask black spots, but opposite-polarity spots are not masked. This suggests fully independent ON and OFF channels for luminance perception. We now show that masking of isoluminant colors is also polarity-specific: while isoluminant red (or green) rings do indeed mask red (or green) spots, there is very little cross-polarity masking. Red rings have little effect on green spots, and green rings have little effect on red disks. This selectivity is nearly as strong as that for Becker & Anstis's luminance stimuli, and much stronger than in Beer & MacLeod's pattern adaptation. These results provide additional strong evidence for polarity-specific chromatic signals for suprathreshold colors.

Beer, D., Becker, M., Anstis, S., MacLeod, D.(2002). Polarity-specific masking of isoluminant colors [Abstract]. Journal of Vision, 2( 7): 546, 546a,, doi:10.1167/2.7.546. [CrossRef]

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