Abstract
Effects of eyelid movements on vertical EOG recording were examined in five subjects. The subjects were instructed to fixate a stationary target, and to change the angle between the edge of upper eyelid and visual axis voluntarily, and compulsively by using a small bar attached to the upper eyelid. In this situation, the eyelid was photographed simultaneously with the D. C. electrooculography recording.As a result, the potential of the upper electrode correlated negatively to the angle between the edge of the upper eyelid and visual axis, and this supported Barry's theory quantitatively.These findings indicate that the EOG recording of upward eye movements associated with eye closure (so called Bell's phenomenon) is contaminated by the artifact of upper eyelid movements.
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