| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥3,300,000 (Direct Cost: ¥3,300,000)
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| Research Abstract |
Psychophysical study of attentional processing was done using several motion-perception based procedures, i.e., visual search, line-motion illusion, and motion after effect. In visual search experiment, we introduced first-and second-order motion patches together within a field of vision, and asked the subject to detect target patch (either first- or second-order motion stimulus) among distrator stimuli. The firs-order and second-order stimulus each indicates luminance-defined and contrast-defined motion stimulus, respectively. The results suggest the independent parallel processing for first-order motion but not for second-order stimulus. In line-motion study, we found passive attention (bottom-up attention) and active attention (top-down attention) operated independently in an early period up to 100ms and later period up to several seconds, respectively. In motion after effect study, we employed sinusoidally shifting grating pattern with fixed temporal and spatial frequency. Subject was asked to watch the pattern for some time, then the moving pattern was stopped and observing motion after effect to reverse direction. The data suggest that additional attention-demanding parallel task decreased the magnitude of after effect. Thus we found attentional processing influences on the duration of after effect.
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