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Journal of Experimental Biology 52,369-384 (1970)
Published by Company of Biologists 1970

Oculomotor Reactions in the Cuttlefish, Sepia Officinalis

H. COLLEWIJN ¹

¹ Dept. of Physiology, Medical Faculty of Rotterdam, Rotterdam, The Netherlands

1. Eye position in Sepia was measured in restrained animals, using a scleral search coil technique.

2. Optokinetic nystagmus was elicited by drum rotations from 0.035 up to 35°/sec.

3. Passive rotation of Sepia in darkness evoked a transient nystagmus, followed by after-nystagmus at arrest.

4. Combination of these two stimuli yielded the best results, but the ratio eye velocity/surroundings velocity was usually not better than 0.5.

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.

6. Fixation movements could not be demonstrated in the present conditions.