| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
Cast shadow is a salient monocular depth cue. In the present study, we investigated which cortical areas are involved in depth perception by moving cast shadow with functional MRI technique. A movie of a motion illusion was presented to participants. They were required to discriminate the perceived motion in depth (approaching and receding) of a square induced by its moving shadow cast on the background. The fMRI result showed activation in the bilateral hMT, V3A, and the right posterior intraparietal sulcus. Activation in these areas was also observed during discrimination of approaching and receding of a square represented by binocular disparity. These results suggest that cortical areas in the dorsal pathway may be involved in the integration of binocular and monocular depth cues and motion perception in depth induced by cast shadow. We have also revealed that macaque monkeys have depth perception by cast shadow by behavioral study.
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