In the present study, we investigated the optomotor response of medaka fish (Oryzias latipes) to the stripes
rotating at sinusoidal speed. We analyzed the angular speed, turning angle and swimming speed of the medaka under
4 conditions of temporal frequencies, 0.1, 0.2, 0.5 and 1.0 Hz. As a result, average angular speed of the medaka was
approximately equal to that of the stripes at all the frequencies tested. Additionally, when the speed of stripes oscillated in
low frequencies (0.1 and 0.2Hz), the medaka followed the stripes with periodic angular speed and turning angle at almost
the same frequencies as those of the stripes. On the contrary, those parameters were not periodic under high frequencies
(0.5 and 1Hz).
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