我々は視覚系を通じて様々な情報を外界から得ている．奥行き情報はその中の一つである．運動視差と呼ばれる奥行き手がかりから奥行き知覚が生じることが分かっている．また先行研究より，前後方向の運動視差では奥行きが知覚しづらいという結果がでている．そこで本研究では．前後方向の運動視差の奥行き知覚がしやすい条件を模索する．%Depth perception from motion parallax has been investigated with right-and-left head movement. From ecological point of view, humans move forward more frequently than sideways. The aim of this study was to determine the influence of the head movement direction on depth perception from motion parallax. We investigated depth perception at and above threshold level with lateral head movement and to-and-fro movement. Stimuli were vertical half cylinders, which was concave or convex, depicted with random dots that move synchronously with head. The viewing distance was 78.5 cm on average. The size of each display was 6.6 × 6.6 deg. The dot density in the entire display was always maintained constant for prevention of depth impression from difference in dot density. Four subjects participated the experiments. Mean threshold for lateral and to-and-fro motion were about 0.1 cm and 5 cm respectively. Mean gains of apparent depth for lateral and to-and-fro motion were about 1 and 0.2 respectively.
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