Visual Target Acquisition and Ocular Scanning Performance

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Abstract
The present research investigated the effects of information and physical variables on visual search performance and on the ocular activity associated with that performance. Three experiments were completed using a brief exposure technique. The manipulated variables included memory load, exposure duration, and the physical grouping of information within a display. Several patterns emerged from the data. Stimulus information appeared to have no effect on eye movement measures. Instead, the physical restrictions imposed on the search task were responsible for changes in ocular behavior. However, there was a substantial effect of information on total search performance. The per item search rate increased as the total information in the display increased. This information effect was interpreted in terms of a variable processing rate hypothesis.

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