A repeated measurements design with 30 undergraduate female Ss and 21 secondary school teachers of psychology was used to compare Ss' visual serial search for letters, Roman and Arabic numbers. Across 30-sec. trials with a 30-sec. rest interval between target displays, independent analyses of data from both groups demonstrated that visual serial search for Arabic numbers was significantly superior to search for letters and search for letters was significantly superior to search for Roman numerals. The outcomes might be related to the relative heterogeneity or balance of linear and curvilinear target features.
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