[Effect of presentation time and background size on texture segregation].
We investigated the effect of presentation time and background size on texture segregation in a large visual field. In Experiment 1, participants were asked to detect a target texture embedded in a large background texture. Texture displays were presented for 68 ms, 119 ms or 221 ms. In Experiment 2, background texture size was made smaller than that in Experiment 1, and the presentation time was 119 ms. The detection rate for the target increased as the presentation time increased. Upright Ts in tilted Ts and tilted Ts in upright Ts were segregated easily in central area, but the detection rate decreased in the periphery area for all the presentation times studied. Upright Ts in Ls and Ls in upright Ts were detected better in the periphery than in the central area on 119 ms condition of Experiment 1. On the other hand, there was no difference in detection rate between the central area and the periphery with smaller backgrounds on Experiment 2. Discriminability for Ts and Ls was not determined only by the retinal position, but it was also affected by distribution of participants' attention in their visual fields.
Institute of Psychology, University of Tsukuba.
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Sekine
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Kikuchi
D000328:Adult; D001288:Attention / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology; D004192:Discrimination, Psychological / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D013028:Space Perception / Q000502:physiology; D014794:Visual Fields