Hue ensemble perception in the presence of distracting stimuli.

Tutkimustuotos: ArtikkelijulkaisuKonferenssiesitelmän abstraktivertaisarvioitu


In natural scenes, objects’ color distributions can be spatially interspersed with unrelated colors. We asked whether the visual system can selectively form an ensemble hue percept over a target hue distribution displayed among distractors. Hues were drawn from uniform distributions (range 30°) on a hue circle in CIELuv color space. A test and a comparison ensemble were presented in two 500-ms intervals, separated by 500 ms. Observers indicated whether the second ensemble appeared bluer or yellower on average than the first ensemble. The test ensemble was either red or green, and comparison hue mean was varied around the test hue mean. The ensemble stimuli in the baseline condition consisted of 18 uniformly colored circles (0.5 degrees of visual angle) located randomly in a 6-by-6 invisible grid with element separation of 1 degree. Distractor conditions included an additional distractor ensemble, filling the 18 vacant spaces in the test ensemble grid. The mean distractor hue differed by -60, +60, or +180 degrees from the mean test hue. Psychometric functions were fit to the proportion of “bluer” responses to estimate perceived test hue and discriminability. Observers were able to selectively judge the test ensemble colors, but discrimination thresholds were higher in distractor conditions, and higher with a 60-degree, compared to 180-degree, test-distractor difference. With a 60-degree test-distractor difference, perceived test hue was significantly biased towards the distractor hues, more for bluer than for yellower distractors. Color ensembles can be segmented by their distributions, but surrounding context may impair the accuracy of color estimates.
DOI - pysyväislinkit
TilaJulkaistu - 2021
OKM-julkaisutyyppiEi sovellu

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