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5 results for “color categorization”
Categorical facilitation with equally discriminable colors
<p>This data supplements the study of:</p> <p>Witzel, C., & Gegenfurtner, K. R. (2015). Categorical facilitation with equally discriminable colors. Journal of Vision, 15(8), 22. doi:10.1167/15.8.22, http://jov.arvojournals.org/article.aspx?articleid=2381517</p> <p>The Excell-file provides the data shown in Figure 4 of the above article, which shows the main results. The first sheet (trained) provides the data for the first, experienced group of participants, the second sheet (naive) the data for the naive, untrained group of participants.</p> <p>Rows refer to the 20 stimulus pairs.</p> <p>Columns:</p> <p>sti_ctg = category membership of each colour in a pair.</p> <p>sti_type = type of colour pair: 1 = centre pair, 2 = boundary, 3 & 4 = transitional pairs</p> <p>sti_azi = Hue (azimuth) in DKL-space</p> <p>rt = response times, one column for each observer</p> <p>er = error rates, one column for each observer</p>
Dataset: Invariant categorical color regions across illuminant change coincide with focal colors
<p>Experimental data for a paper titled "Invariant categorical color regions across illuminant change coincide with focal colors“ published in Journal of Vision.</p> <p>This repository contains following data. Please refer to the article for details about the dataset.</p> <p> </p> <p><strong>1. IlluminantsANDReflectances.xlsx</strong></p> <p>This file stores spectral radiance for each illuminant and OSA coordinates (jgL) and reflectance values for 424 OSA color samples.</p> <p> </p> <p><strong>2. Exp1_1_RawData</strong></p> <p>Raw data for Experiment 1-1.</p> <p>This folder has xlsx files, and filename indicates the illuminant condiion.</p> <p>In each xlsx file, different sheets contain a different observer’s data.</p> <p>The number (1-424) corresponds to the number of OSA sample (shown in IlluminantsANDReflectances.xlsx).</p> <p> </p> <p><strong>3. Exp1_2_RawData</strong></p> <p>Raw data for Experiment 1-2. The same format as Exp1_1_RawData.</p> <p> </p> <p><strong>4. Exp2_RawData.xlsx</strong></p> <p>Raw matching data for Experiment 2.</p> <p>The name of each sheet shows the observer & illuminant condition.</p> <p>Each row shows Ljg coordinates of the OSA sample and associated matching result (in RGB and xyL).</p>
The color communication game: how categorical understanding of colors can be shown without considering color naming data
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Comparison of categorical color perception in two Estrildid finches
<p>Sensory systems are predicted to be adapted to the perception of important stimuli, such as signals used in communication. Prior work has shown that female zebra finches perceive the carotenoid-based orange-red coloration of male beaks—a mate choice signal—categorically. Specifically, females exhibited an increased ability to discriminate between colors from opposite sides of a perceptual category boundary than equally-different colors from the same side of the boundary. The Bengalese finch, an Estrildid finch related to the zebra finch, is black, brown and white, lacking carotenoid coloration. To explore the relationship between categorical color perception and signal use, we tested Bengalese finches using the same orange-red continuum as in zebra finches, and also tested how both species discriminated among colors differing systematically in hue and brightness. Unlike in zebra finches, we found no evidence of categorical perception of an orange-red continuum in Bengalese finches. Instead, we found that the combination of chromatic distance (hue difference) and Michelson contrast (difference in brightness) strongly correlated with color discrimination ability on all tested color pairs in Bengalese finches. The pattern was different in zebra finches: this strong correlation held only when discriminating between colors from different categories, but not when discriminating between colors from within the same category. These experiments suggest that categorical perception is not a universal feature of avian, or even Estrildid finch, vision. Our findings also provide further insights into the mechanism underlying categorical perception and are consistent with the hypothesis that categorical perception is adapted for signal perception.</p>
Comparison of categorical color perception in two Estrildid finches
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