平面に投影された影から三次元物体の立体形状を知覚することは出来ないが，物体を回転させると立体形状を知覚できる（KDE）．これは奥行き知覚の手がかりとして強力であるが，凸凹・回転方向の知覚に関して唆昧性が残る．本研究では，観察者が手を用いて刺激の回転を能動的に制御した場合，凸凹・回転方向の曖昧性が解決されるか調べた．%Though we can't perceive that three - dimensional shape of three - dimensional object from shadow projected to the flat surface, we can perceive that three - dimensional shape by rotating object (kinetic depth effect). Though this is powerful as clue of depth perception, it leaves ambiguity as to perception of irregularities and rotation direction. In this study, we examined whether ambiguity of irregularities and rotation direction were solved when observer actively controlled rotation of stimulus by hand.
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