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• W2017100816 abstract "Two major, parallel channels in the visual system are the broad-band and the color-opponent pathways (4). Since the broad-band pathway is unresponsive to differences in hue (I), Livingstone and Hubel (2) have proposed that equiluminant stimuh will result in the diminution or loss of percepts which are subserved by the broad-band pathway; specifically, Livingstone and Hubel proposed that the percepts of motion and depth will be greatly diminished or lost with equiluminant stimuli. The current investigation considered only the effect of equiluminance on the perception of depth, and it was hypothesized chat an equiluminant Necker cube would not be perceived to reverse in depth (or would reverse in depth infrequently), since the percept of depth, in Livingstone and Hubel's view as noted above, is subserved by the broad-band channel or color-blind-brightness-driven channel. Observers were 12 undergraduate volunteers from classes in general psychology and applied behavioral management. The stimuli were two Necker cubes; each was mounted on an N 51 background measuring 14.5 cm vertically and 21.5 cm horizontally. The nonequiluminant-control Necker cube was constructed of N 31, and the equiluminant Necker cube was constructed of 5R 516. The lines forming both cubes were 3 mm wide. The edges of the facets which are perceived to alternate in depth were 4 cm long, and the edges connecting the alternating facets were 2 cm in length. The illumination on the vertically presented stimuli was 2.6 foot-lamberts as measured by spotmeter on N 51 at the observers' viewing distance of 78 in. Initially, observers were shown a black Necker cube on a white ground and were advised that the cube is frequently perceived as reversing in depth-with first one facet appearing to be forward and then the other facet appearing to be forward. All observers reported experiencing the phenomenon. Observers were then instructed to attend passively to the stimuli described above, and they were asked to report each time that they perceived a reversal in depth. The cube presented first, the control or equiluminant cube, was determined by an ABBA order across observers. Each cube was viewed for 2 min., and the number of reversals reported during this period was tabulated for each observer. The average number of reversals reported with the control Necker cube, i.e., the N 31 cube on N 51 ground, was 35.4. The average number of reversals with the equiluminant Necker cube, i.e., the 5R 516 cube on N 51 ground, was 32. The data were evaluated using a t test for correlated observations (obtained t,, = 1.32, p>.O5, one.tailed test). It was concluded that the numbers of reversals of control and equiluminant stimuli were not significantly different. These data are consistent with the physiological data of Logothetis, et al. (3), which indicated a compromise of depth perception by equiluminant stimuli but not a loss of depth perception. Hence, equiluminant stimuli appear not to accomplish a psychophysical segregation of phenomenal depth." @default.
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• W2017100816 date "1990-06-01" @default.
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• W2017100816 title "Depth Reversals with an Equiluminant Necker Cube" @default.
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• W2017100816 doi "https://doi.org/10.2466/pms.1990.70.3c.1088" @default.
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