Some evidence for unequal loss of location and feature information as a function of retinal eccentricity in visual search

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Abstract
Several psychophysical studies suggest that the quality of feature and positional information deteriorates differentially as a function of retinal eccentricity. Nevertheless, current models on visual search do not deal with such a difference. Two experiments have been executed in order to investigate whether eccentricity of target location affects the slope of the function relating reaction time (RT) to display size differently in a feature-search task compared to a task in which subjects search for the absence of a feature–that is, an absence-search task. The results showed that in the latter search rates strongly decreased when display elements were presented further from central fixation. In feature search there was no such effect. It is suggested that slope differences are related to the extent to which the attentional system is involved in compensating for inferior positional information in eccentric vision.

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