Perception of Blue - Psychophysics
- Grating resolution ~10 (Williams & Collier,1983), but less than 16 c/deg (Stromeyer, Kranda and Sternheim, 1978)
- Cone Spacing via psychophysics 10 minutes or 5-7 blue cones/degree (Williams, MacLeod & Hayhoe, 1981)
- Moire patterns are most visible at 8-10 c/deg (Williams & Collier, 1983). They appear to change with eye-movements.
- Blue cones make up 5% of the cone array (Krauskopf, Williams & Heeley, 1981)
- "...no more than two cones could feed the center to any substantial extent" (Sekiguchi and Williams, 1993)
- Transient tritanopia - following the offset of a yellow field, detection threshold of a blue increment is markedly higher for about a second than it is when the yellow field is present.
- The effect is larger for higher luminance yellows
- The effect dissipates more slowly for higher luminance yellows
- Blue cones are missing from the very center of the fovea. No sign of B cone response within 10 minutes of the fixation center. (Williams, MacLeod & Hayhoe, 1981)
- Peak sensitivity: annular zone at about 1 degree centered around the fixation (Stiles, 1949; Brindley, 1954)
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© 1995 Lance Hahn (email@example.com)