Abstract
This paper clarifies the relation and characteristics of the accommodation and motion detection mechanisms while multiple apparent motion stimuli are being observed. We made these clarifications by measuring the correspondence between motion appearances and accommodative responses to double apparent motion stimuli consisting of two kinds of sine-waves shifted abruptly in opposite directions. We found that (1) a critical spatial frequency exists where two kinds of motion appearances (capture and transparency) dependent on attention change into one kind of motion appearance (capture) independent of attention, (2) different accommodative states are induced depending on the differences in motion appearance under the critical frequency and in spatial frequency structure over the critical frequency, and (3) the above results are independent of the average temporal frequency and the frame number per period of the apparent motion. These results suggest that the relation of the two mechanisms is also cooperative for multiple apparent motion stimuli and is independent of the degree of their intermittent motion.
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