[Texture segregation in large visual field].
Using large texture stimuli (72 degrees x 72 degrees or 20 degrees x 20 degrees), we investigated spatial properties of texture segregation. In Experiment 1, we used L-like forms, T-like forms, or tilted T-like forms to create a large background texture field, in which a small target region of the odd forms was embedded. The texture display was presented for 255 ms, and subjects were asked to detect the target and to recall its position. The target upright Ts in the tilted Ts and the target tilted Ts in the upright Ts segregated easily. In contrast to our expectation, however, the target upright Ts in the Ls and the target Ls in the upright Ts were detected better in the periphery than in the central area. In Experiment 2, subjects were asked to detect a single target element embedded in the background. The size of the elements was enlarged to that of the target texture region in Experiment 1. The target Ts and Ls were detected better in the central area than in the periphery. These results can be explained by the differential grouping processing and distribution of attention in the visual field.
Sekine
M
M
Institute of Psychology, University of Tsukuba, Ibaraki.
Kikuchi
T
T
D000328:Adult; D001288:Attention; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D014794:Visual Fields / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*