Abstract：
:Increment-threshold spectral sensitivity functions were taken foveally and at four other retinal locations with different sized test stimuli. For the fovea and parafovea at 4 degrees, a 1 degree, 250 msec stimulus of variable wavelength, flashed on a 1000 td white background yielded spectral sensitivity curves with three distinct maxima located near 455, 530-540 and 600 nm. As eccentricity increased so did the minimum spot size needed to produce spectral curves with three peaks. In particular, the 2 degrees 10' spot at 20 degrees, 4 degrees 10' at 30 degrees and 5.5 degrees at 45 degrees gave this result. Smaller stimuli in the periphery yielded curves with a minor peak at 455 nm, present under some conditions, and a major broad peak at 560 nm that resembled the CIE photopic luminosity function. Two different systems subserve detection: the three-peaked curves indicate mediation by the opponent-color system while the other type of function can be attributed to the non-opponent system.
journal_name
Vision Resjournal_title
Vision researchauthors
Kuyk TKdoi
10.1016/0042-6989(82)90142-0subject
Has Abstractpub_date
1982-01-01 00:00:00pages
1293-7issue
10eissn
0042-6989issn
1878-5646pii
0042-6989(82)90142-0journal_volume
22pub_type
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