Abstract
Lateralisation of colour categorical perception has been investigated in a variety of studies, and the pattern of how the colour categorical perception lateralised is still being debated. It is possible that habitual scanning can help with this debate. The purpose of this study was to look into the effect of reading direction on the pattern of colour categorical perception. The study included sixteen right-to-left readers, all native Arabic speakers, 6 females and 10 males, ranging in age from 20 to 34 years old, with a mean age of 28.19 years (SD = 3.97). Lateralisation of colour categorical perception was tested using a target detection task with an eye-movement measure to a fixation point. Each participant’s eye movement timing from target onset to a fixation point was calculated in each hemisphere (left-right) and category (within-between). Anova 2 ways repeated measure was applied. This study did not replicate the pattern of lateralisation colour categorical perception demonstrated by left to right readers. Right to left readers did not support the left hemisphere lateralisation for colour categorical perception. This result raises the question of whether reading direction plays a role in the lateralisation of colour categorical perception.
Highlights
The colour spectrum is a physical continuum of a wavelength of light that is perceived discontinuously, as discrete categories or segments of hues (Harnad, 1987)
In another study by Simola et al (2009) in which the effect of habitual scanning on target detection task was investigated, an effect of parafoveal preview on target detection was discovered; participants having right-to-left script readers benefited from parafovea information to the right of fixation, whereas this was not the case for the left-to-right script readers who benefited from parafovea information to the left of fixation. These findings suggested that detecting a target on display should be better in one visual field than the other, and that this should be dependent on habitual reading direction
Aim of the Study This study investigated the possible effect of habitual scanning on the pattern of colour categorical perception, by comparing the results from right-to-left script readers to the pattern shown from left-to-right readers in English (Gilbert et al, 2006; Daoutis et al, 2006; Drivonikou et al, 2007a)
Summary
The colour spectrum is a physical continuum of a wavelength of light that is perceived discontinuously, as discrete categories or segments of hues (Harnad, 1987) CP can be defined experimentally as faster/more accurate discrimination of a pair of colours drawn from a different category boundary than two pairs from the same category. This occurs even when the differences in stimulus between the pairs of stimuli are equal (Gilbert et al, 2007; Roberson et al, 2008). Same-different (Boynton et al, 1989), similarity judgements (Roberson et al, 1999), visual search and target detection tasks (Daoutis et al, 2006; Al-Rasheed et al, 2014), and X-AB tasks (Pilling et al, 2003)
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