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CP (categorical perception) of colour is demonstrated by faster and/or more accurate discrimination of pair of stimuli that cross a category boundary (across-category), than two stimuli from the same category (within-category), even when the stimulus differences between the pairs of stimuli are equal. Despite a plethora of behavioural research exploring the origin and nature of colour CP, all the evidence for the CP of colour was derived from Roman script readers and as, to date, no studies of colour CP have been conducted on right-to-left readers in support of this theory. However, the influence of reading habits to perception has been shown in several studies (e.g., Eviatar, 1995, 1997; Farid & Grainger, 1996; Prunet, Beland, & Adrissi, 2000; Berent, 2002; Schwalm, Eviatar, Golan, & Blumenfeld, 2003). It is not entirely clear how to predict the effect of habitual reading direction on CP of colour, but it was worth exploring to test the generality of CP of colour across variation of cultures and habitual reading directions. Two experiments (target detection task and grid search task) have been conducted to investigate the colour CP, by testing participants from language, their reading direction is from right-to-left as in Arabic. Forty participants (20 men and 20 women) took part in this study. All spoke Arabic as their first language and most were undergraduate students at King Saud University. Their ages ranged from 18 to 30 years with a mean of 24.3 years (SD = 5.29). The result indicated that the reaction times in the between-categories condition were much faster than those in the within-category condition; this suggested that CP of colour was unaffected by the habitual reading directions. So that Arabic samples performed similarly as Roman script readers and the pattern of colour CP has been replicated, but this time, it has also been shown that the effect is independent of habitual reading direction.

Categorical Effects in the Perception of Colour: Behavioral Evidence in Hue Search Method