Eye movements in the african cichlid fish haplochromis burtoni

Fernald, R.D.

Journal of Comparative Physiology A Sensory Neural and Behavioral Physiology 156(2): 199-208


DOI: 10.1007/bf00610862
Accession: 005437201

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There are 3 distinct kinds of coordinated eye-body movements in the African cichlid fish, Haplochromis burtoni, as revealed by cinematographic analysis: eye movements without coordinated body movements (voluntary saccades); nystagmus consisting of compensatory eye movements during turning of the body and a reset saccade movement of the eyes; fast body turns executed without corresponding eye movements. During voluntary scanning eye movements the eyes usually move in temporal synchrony and often the result is a decreased angle between the eyes (increased convergence of the eyes). Compensatory eye movements produce successive fixation of the gaze direction during a slow rotation of the body which serve to maintain the angular orientation of the eyes in space. No systematic change in convergence is associated with these turns. Fast body turns are very rapid body turns without compensatory eye movements which occur almost exclusively during social interactions. When the animals are freely swimming, these 3 types of eye-body movements occur in all possible sequences.

Eye movements in the african cichlid fish haplochromis burtoni