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Christoph Witzel, Karl R. Gegenfurtner; Is there a lateralized category effect for color?. Journal of Vision 2011;11(12):16. doi: 10.1167/11.12.16.
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According to the lateralized category effect for color, the influence of color category borders on color perception in fast reaction time tasks is significantly stronger in the right visual field than in the left. This finding has directly related behavioral category effects to the hemispheric lateralization of language. Multiple succeeding articles have built on these findings. We ran ten different versions of the two original experiments with overall 230 naive observers. We carefully controlled the rendering of the stimulus colors and determined the genuine color categories with an appropriate naming method. Congruent with the classical pattern of a category effect, reaction times in the visual search task were lower when the two colors to be discriminated belonged to different color categories than when they belonged to the same category. However, these effects were not lateralized: They appeared to the same extent in both visual fields.
Notes: 1Liu et al. (2009) do not report results of separate t-tests for each visual field.
2The specifications concern the pretraining measurement for the experimental group (Zhou et al., 2010, p. 9975).
3The reaction time differences are taken from Paluy et al.'s Figure 2 for the 11 controls only; the results of the analysis of variance, though, are from a 3-way ANOVA that includes patients (with df = 16).
Notes: 1These values have been inferred from the information given in Drivonikou et al. (average category effect and lateralized category effect were both reported to be about 60 ms).
2Liu et al. (2008) used the procedure of Drivonikou et al. together with the stimuli of Gilbert et al. They did only a three-way analysis of variance including a condition with verbal interference task as the third factor (p. 11). Hence, the statistics of the interactions are not directly comparable, and results of t-tests are not provided in the article. Moreover, this study only appears in the upper part of the table because it only used a green–blue stimulus set. This green–blue set does not contain near-distance stimulus pairs.
3Since the reaction time pattern contradicted the category effect (see negative sign in columns 3 and 6), it does not make sense to report its lateralization.
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