中心視野と周辺視野における特徴探索

概要

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In feature search task, detection performance in the central visual field has been said to be superior to the peripheral. However, Carrasco and Frieder (1997) reported that by cortically magnifying the stimuli, the performance of feature search task was equated over the visual fields. We conducted feature search experiments, in which subjects judged the orientation of the target to compare the temporal dynamics of visual search between the visual fields by using the speed accuracy trade-off procedure. We equated the sensitivity to the visual stimuli in the central and peripheral visual fields by the cortical magnification factor. In the results, the search performances in the early phase were identical across the visual fields. However, in the late phase, the performance in the central visual field was superior to the peripheral. These results indicate that a feature search performance in the different visual fields depends on not only the cortical magnification factor, but also the temporal dynamics of feature search process based on early temporal mechanisms and attentional mechanisms.
2003-03-31