運動視における上下視野非対称性

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We investigated mechanisms mediate motion perception of missing fundamental (MF) gratings at interstimulus intervals (ISIs) of about 40 ms. At ISIs grater than about 40ms, apparent motion for MF gratings was perceived in the direction of displacement (Georgeson & Harris, 1990^<[1]>). At ISIs greater than about 160msec, clearer apparent motion in the direction of displacement is perceived when exposed in lower visual field than in upper visual field (Mugishima & Sato, 1998^<[2]>). However, there is no asymmetry between the upper and lower visual field at ISIs of about 40 ms. This asymmetry suggests the participation of the process of feature tracking in motion detection. Therefore, there seems no contribution of the feature tracking process at these ISIs. In Experiment 1, no motion aftereffect was induced after adaptation to apparent motion using MF grating at ISIs 40ms. In Experiment 2, attention was divided by dual task. One is direction discrimination of apparent motion using MF grating presented peripheral visual field. The other is to read English letters presented central visual field. The result was that apparent motion was seen in the reversed direction under all conditions at ISIs 20-160 ms. These results suggest (a) a higher-order motion detection mechanisms mediate apparent motion in the direction of displacement at ISIs of about 40 ms, and (b) attention plays some role in these mechanisms in the different manner of featuretracking.
社団法人映像情報メディア学会の論文
1999-06-07

運動視における上下視野非対称性

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