奥行運動残効に及ぼす離反運動の効果

抄録

A visual information process that induces motion-in-depth aftereffects was studied. In experiment 1, two vertical lines moving away from each other (antiphase component) in a saw-tooth waveform fashion were presented as the adaptation stimulus. After adaptation, (1) two static lines or the vertical edges of a square were perceived to be approaching each other. Subsequently, (2) these stimuli were perceived to be moving away from the head (motion-in-depth aftereffect). (3) The motion aftereffect (MAE) was induced on a single-line stimulus consisting of the antiphase component. In experiments 2 and 3, the two lines moving along the direction of the antiphase component were alternatively presented with various temporal sequences. It was found that (4) the approaching movement was induced by the alternative adaptation of two moving stimuli. Consequently, (1), (3), and (4) could be explained in terms of the adaptation of motion detectors responding to the frontal-parallel motion. The motion-in-depth aftereffect of (2) induced by the adaptation of the antiphase component, however, could not be explained in terms of MAE. These results suggest that our visual system contains a mechanism that responds to the antiphase component included in a changing-size image of motion-in-depth.