Upon the Correlation between the Optokinetic Stimulus and the Induced Optokinetic Nystagmus

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Abstract
Electronystagmographic studies of optokinetic nystagmus in normal individuals, examined under a variety of test conditions, are demonstrating that the characteristics of the induced optokinetic nystagmus are determined by the number and size of optic targets, i.e. optokinetic stimuli. If the number of targets is small, the eye speed of the slow component will increase in accordance with the increment of the target speed, even within a high speed range. However, if a great number of targets is used, the eye speed will be attaining its maximum during the course of acceleration, but as soon as a certain critical value is overstepped, it will begin to decrease gradually. The maximum eye speed of the slow component is found to be decreasing in accordance with the increment of the number of targets. Within the range of slow speed stimulation, an increase of the number of targets will also include an increase of optokinetic nystagmus frequency. Within a high speed range, also frequency will be decreasing if the number of targets is exceeding a critical value. If the target’s size is small, it will act as a single stimulus. If the target’s size is large, it will only act as one stimulus within the range of slow stimulation. However, within a high speed range, apparently, both edges of the target are acting as separate stimuli.

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