ABSTRACT
Eye position in Sepia was measured in restrained animals, using a scleral search coil technique.
Optokinetic nystagmus was elicited by drum rotations from 0·035 up to 35°/sec.
Passive rotation of Sepia in darkness evoked a transient nystagmus, followed by after-nystagmus at arrest.
Combination of these two stimuli yielded the best results, but the ratio eye velo city/surroundings velocity was usually not better than 0·5.
Eye movements were conjugate and a closed eye could be driven by a seeing eye. Monocular reactions were smaller than binocular ones, but equal in both directions.
Fixation movements could not be demonstrated in the present conditions.
Copyright © 1970 The Company of Biologists Ltd.
1970
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