We investigated whether perceiving depth from a motion-parallax stimulus enhances the predominance of that stimulus in binocular rivalry. A horizontally moving random- dot motion-parallax stimulus was presented to one eye and a vertically moving non- motion-parallax stimulus was presented to the other eye. The horizontally moving stimulus was ecologically valid as a motion-parallax stimulus since its direction of motion on the retina was consistent with the observer’s lateral head movements. On the other hand, the vertically moving stimulus was ecologically invalid since its direction of motion was inconsistent with the head movements. In the experimental condition, observers viewed these rival stimuli while moving their heads laterally back and forth; each stimulus motion was yoked to the observers’ head movements. In the control condition, observers viewed the same rival stimuli without head movement. The average duration of seeing the horizontally moving stimuli in the experimental condition was longer than that of the control condition. We conclude that an ecologically valid stimulus for depth perception enhances the predominance of motion- parallax stimuli in binocular rivalry.(運動視差刺激から奥行きを知覚することが、両眼視野闘争における視知覚の優位性を強化させるかを検討した。観察者は、頭を左右に動かしながら視覚刺激を観察し、頭部運動に連動して、水平方向に運動する刺激（運動視差あり）と垂直方向に運動する刺激（運動視差なし）がそれぞれの目に呈示された。その結果、水平方向に運動する刺激のほうが垂直方向に運動する刺激よりも両眼視野闘争において優位な期間が長くなることが示された。）
Kenzo Sakurai, Michiaki Shibata, Toshio Kubodera, Hiroshi Ono.
