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Categorical perception of color: evidence from secondary category boundary.

Al-Rasheed AS - Psychol Res Behav Manag (2015)

Bottom Line: All spoke Arabic as their first language, and all were undergraduate or postgraduate students at King Saud University.Their ages ranged from 18-35 years with a mean age of 21.9 years (SD =5.2).The result indicated that for Experiments 1 and 2, it appeared that the Arabic blue-purple category boundary was approximately 10PB and it is in the same location as for English.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, King Saud University, Riyadh, Kingdom of Saudi Arabia.

ABSTRACT
Despite a plethora of behavioral research exploring the phenomenon of color categorical perception (CP) known as "better discrimination between pair of colors stimuli from different categories and pair of colors stimuli from the same category even when the stimulus differences between the pairs of stimuli are equal", most of the evidence for the CP of color was derived from Roman or top-to-down script readers and very rarely from right-to-left script readers in primary category. To date, no studies of color CP have been conducted on right-to-left script readers in secondary category boundary to support this theory. Three experiments have been conducted: Experiments 1 and 2 established the Arabic blue-purple secondary category boundary, and Experiment 3 tested the CP of color in the blue-purple category boundary. Sixty participants (30 men and 30 women) took part in this study. All spoke Arabic as their first language, and all were undergraduate or postgraduate students at King Saud University. Their ages ranged from 18-35 years with a mean age of 21.9 years (SD =5.2). The result indicated that for Experiments 1 and 2, it appeared that the Arabic blue-purple category boundary was approximately 10PB and it is in the same location as for English. For Experiment 3, reaction times in the between-categories condition were significantly faster than those in the within-category condition; this suggested that CP of color was shown in the Arabic's blue-purple secondary category boundary.

No MeSH data available.


Related in: MedlinePlus

Example of the grid task.Note: The white squares indicate the positions of the target and distractors; + indicates the fixation points
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f7-prbm-8-273: Example of the grid task.Note: The white squares indicate the positions of the target and distractors; + indicates the fixation points

Mentions: Adjacent stimuli were paired, to form one within-category pair (blue1–blue2) and one between-category pair (blue1–purple1). For each pair, one stimulus was the target, and the other stimulus was used for the distractors, with both stimuli in a pair appearing equally often as distractors. The target for all trials was always blue, and the distractors were randomly switched between “within” (blue) and “across” (purple). There were equal numbers of trials for each combination of within category or between category, and the order of trials was randomized across these two categories. In addition, target location was randomized across trials with the constraint that the target appeared equally often to the left, right, top, and bottom of fixation. Stimuli were shown as 2.5 cm squares with 5 mm gaps between adjacent locations, appearing in locations specified by a 3×3 square grid on the display (Figure 7). The target appeared among eight distractors on a gray background (19.47 cd/m2, 0.336 cd/m2, 0.344 cd/m2). The distractors plus the target stimulus locations within the grid were randomly selected.


Categorical perception of color: evidence from secondary category boundary.

Al-Rasheed AS - Psychol Res Behav Manag (2015)

Example of the grid task.Note: The white squares indicate the positions of the target and distractors; + indicates the fixation points
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664492&req=5

f7-prbm-8-273: Example of the grid task.Note: The white squares indicate the positions of the target and distractors; + indicates the fixation points
Mentions: Adjacent stimuli were paired, to form one within-category pair (blue1–blue2) and one between-category pair (blue1–purple1). For each pair, one stimulus was the target, and the other stimulus was used for the distractors, with both stimuli in a pair appearing equally often as distractors. The target for all trials was always blue, and the distractors were randomly switched between “within” (blue) and “across” (purple). There were equal numbers of trials for each combination of within category or between category, and the order of trials was randomized across these two categories. In addition, target location was randomized across trials with the constraint that the target appeared equally often to the left, right, top, and bottom of fixation. Stimuli were shown as 2.5 cm squares with 5 mm gaps between adjacent locations, appearing in locations specified by a 3×3 square grid on the display (Figure 7). The target appeared among eight distractors on a gray background (19.47 cd/m2, 0.336 cd/m2, 0.344 cd/m2). The distractors plus the target stimulus locations within the grid were randomly selected.

Bottom Line: All spoke Arabic as their first language, and all were undergraduate or postgraduate students at King Saud University.Their ages ranged from 18-35 years with a mean age of 21.9 years (SD =5.2).The result indicated that for Experiments 1 and 2, it appeared that the Arabic blue-purple category boundary was approximately 10PB and it is in the same location as for English.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, King Saud University, Riyadh, Kingdom of Saudi Arabia.

ABSTRACT
Despite a plethora of behavioral research exploring the phenomenon of color categorical perception (CP) known as "better discrimination between pair of colors stimuli from different categories and pair of colors stimuli from the same category even when the stimulus differences between the pairs of stimuli are equal", most of the evidence for the CP of color was derived from Roman or top-to-down script readers and very rarely from right-to-left script readers in primary category. To date, no studies of color CP have been conducted on right-to-left script readers in secondary category boundary to support this theory. Three experiments have been conducted: Experiments 1 and 2 established the Arabic blue-purple secondary category boundary, and Experiment 3 tested the CP of color in the blue-purple category boundary. Sixty participants (30 men and 30 women) took part in this study. All spoke Arabic as their first language, and all were undergraduate or postgraduate students at King Saud University. Their ages ranged from 18-35 years with a mean age of 21.9 years (SD =5.2). The result indicated that for Experiments 1 and 2, it appeared that the Arabic blue-purple category boundary was approximately 10PB and it is in the same location as for English. For Experiment 3, reaction times in the between-categories condition were significantly faster than those in the within-category condition; this suggested that CP of color was shown in the Arabic's blue-purple secondary category boundary.

No MeSH data available.


Related in: MedlinePlus