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- W2080208514 abstract "Abstract Experiments on spatial summation were done on the temporal retina between 4° and 40° eccentricity. The stimuli were circular discs between 7′ and 280′ of arc dia and 0.01 sec exposure at backgrounds from 0 to 10−8 W/deg2. The wavelength of the light was 510 nm for both background and test stimulus. The diameter of “Ricco's region” increases between 4° and 15° eccentricity and has an almost constant value of 100′ between 15° and 40°. For the smallest stimuli, deviations from Ricco's law were found. It appeared in increased thresholds between 15° and 40° eccentricity. We called this phenomenon the non-summation effect. The dependence of retinal sensitivity on eccentricity differs for different sizes of test stimulus and for absolute, scotopic and photopic background intensities. At photopic conditions increment thresholds are governed by Weber's law, the Weber fraction: increment intensity/background intensity (Δ/LL) being dependent on retinal location and test stimulus size. For scotopic and mesopic adaptation levels at 7° eccentricity and small stimulus sizes the De Vries-Rose law:Δ/LL0.50= constant holds. The transition from these power functions into Weber's lawΔ/LL= c occurs all over the retina within the same narrow range of background intensities. Only the small stimuli that are subject to the non-summation effect also show a different behaviour in this respect." @default.
- W2080208514 created "2016-06-24" @default.
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- W2080208514 date "1977-01-01" @default.
- W2080208514 modified "2023-09-26" @default.
- W2080208514 title "Psychophysical experiments on spatial summation at threshold level of the human peripheral retina" @default.
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- W2080208514 doi "https://doi.org/10.1016/0042-6989(77)90131-6" @default.
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