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Effect of task, selection set, and dispersion of attention on visual identification time.

Schioldborg, P., Paus, E. & Myhre, G. Effect of task, selection set, and dispersion of attention on visual identification time. Scand. J. Psychol., 1973, 14, 195–198. Letters and digits were presented in rows of one, two, or three, and the time required for identifying their position, colour, class, or names recorded for three subjects. The identification tasks were performed under three different conditions of preparatory set, making use of position, colour, and class as selecting attributes. (1) Under each selection set, only the identification of letters and digits as such required more time with increasing number of items, indicating limiting conditions for a “constancy” model of attention. (2) For all identification tasks, selection procured by class yielded longer identification time than selection by position or colour, suggesting different levels of complexity in information processing. (3) Identification of class under a position set, or position under a class set, required less time than the corresponding combinations with colour in place of position, suggesting that analysis of form and position relate basically to the same processes.