Abstract
Visual accommodative responses to multiple motion patterns are examined using an infrared optometer. The stimuli are compound waves (Fourier stimuli) consisting of two drifting sinusoidal waves with opposite motion directions and amplitude-modulated waves (non-Fourier stimuli) whose carrier and signal sinusoidal components move in opposite directions. Accommodative responses are measured while each component wave's motion is paid attention to. It is shown that there exist two kinds of accommodative states which accompany two kinds of motion appearance characteristics depending on which component wave's motion observers pay attention to, irrespective of the viewing distance, and that the degree of the retinal image's blur becomes larger with a decrease in the spatial frequency of the attention-getting component wave. These results suggest that accommodation for motion images is determined based on the interaction between the accommodation mechanism and the motion detecting mechanism.
