Abstract
The on-, off-response of optokinetic nystagmus was investigated in 12 normal human subjects. Step optokinetic stimulation generated by an Ohm type optokinetic stimulation drum was used.The slow phase eye velocity of the nystagmus induced by this step stimulation reached maximum eye speed from the first nystagmus beat. This result in humans was different from that in the monkey and other animal experiments. This may be due to the well developed smooth pursuit system or direct optokinetic pathway in humans compared to other animal species. The steady state of the optokinetic nystagmus was actually not steady. The slow phase eye speed of the nystagmus decreased gradually during 30 seconds of constant velocity optokinetic stimulation.The slow phase eye velocity of the optokinetic off-response (OKAN) gradually decreased after the cessation of stimulation. The decrease of OKAN in darkness was a two-component process which can be closely approximated by an equation containing the sum of two exponential terms. This indicates that there may be two neural integrators in the brainstem to generate OKN and OKAN in normal humans.
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