The hue-wavelength relation was investigated using a color-naming technique which enabled Ss to assign numerical weights to component hties associated with the long wavelength part of the spectrum. Ss were found capable of giving more information than when using more quantal methods, with a high degree of reliability. Red, orange, yellow, and green were evaluated on the basis of criteria established for the uniqueness of perceived hue. Evidence was presented which indicated that the hue associated with the color name orange is not unique in all aspects. It was concluded that the hues associated with the long wavelength part of the spectrum could be adequately described without the orange response category.
Monochromatic light, when mixed with white light, not only becomes desaturated but also changes in hue ( Abney effect). This effect was studied in three observers by using three unique hues (blue, green, and yellow) and four compound (intermediate) hues. The whites used for desaturation ( desaturants ) included Abney 's white (3890 K), two bluish whites (10,000 and 20,000 K), and each observer's own, perceptually neutral white (6200-6980 K). Test stimuli of 0.5 degree diameter were presented to the dark-adapted fovea for 1 sec in a dark surround. Abney 's results were confirmed, except in the shortwave and middle-wave parts of the spectrum. At short wavelengths we always observed a hue shift toward increasing redness, whereas Abney reported a shift toward blue. At middle wave-lengths (500-556 nm), we found smaller effects than did Abney . Here Abney 's white produced an increase in perceived yellow, whereas all other desaturants produced an increase in perceived green. Two colors, blue-green and yellow, changed least. In general, the hue shifts increased with decreasing colorimetric purity (from 1.0 to 0.5). The results are discussed in relation to color additivity, constant-hue loci, and the Benzold -Br ucke effect.
Spike activity of single optic tract fibres and lateral geniculate cells of the lightly anaesthetized immobilized cat were recorded in response to short, small (local) test flashes into the receptive field center before, during and after rapid displacements of a remote, large (global) pattern. 2. The majority of retinal and geniculate neurons failed to produce algebraic summation of the excitatory shift-effect and an excitatory test response. 3. For many cells outside lamina A and A1 of the dorsal lateral geniculate body the test response was smaller than the control even though two excitatory responses were combined. 4. The resonses to displacements of a steady, local spot are weakly affected by simultaneous displacements of a global pattern if the local responses are strong; but if the latter are weak the global shift-effect dominates the response to a displacement of the total pattern. 5. Saccadic suppression may be explained by retinal and geniculate neurons functioning in two modes of local or global responses, both of which cannot be transmitted properly at the same time.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.