Potential changes and eyelid microvibration elicited by flash stimulation

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Abstract
The reflex evoked by various external stimuli, especially photic stimuli, is well known and is utilized clinically. One of the methods to detect this reflex is to place a piezoelectric element pickup on the eyelid and record the microvibration as changes in acceleration, another is to place an electrode on the eyelid and record the changes in potential. In man, these changes in microvibration and potential evoked by photic stimuli are called the photopalpebral reflex (Inanaga et al.); in the mechanism of development, blinking is said to be related to the early component, while upward rolling of the eye, to the late component. Inanaga et al. and Ozaki et al. also report that this reaction becomes smaller during sleep and larger with mental activity; experimental data indicate that it is also related to the state of consciousness. Basic studies, on the photopalpebral reflex however, have not yet been conducted in animals. In this study, experiments were conducted in [rabbits] to clarify the mechanism of this reaction. The photopalpebral reflex, recorded as the changes in potential, was designated as the PPR, the wave pattern, recorded as changes in acceleration, as MV, and the 2 differentiated.