Eye movements in the African cichlid fish,Haplochromis burtoni
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Summary
- 1.
There are three distinct kinds of coordinated eye-body movements in the African cichlid fish,Haplochromis burtoni, as revealed by cinematographic analysis: a) eye movements without coordinated body movements (voluntary saccades); b) nystagmus consisting of compensatory eye movements during turning of the body and a reset saccade movement of the eyes; c) fast body turns executed without corresponding eye movements.
- 2.
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).
- 3.
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.
- 4.
Fast body turns are very rapid body turns without compensatory eye movements which occur almost exclusively during social interactions.
- 5.
When the animals are freely swimming, these three types of eye-body movements occur in all possible sequences.
Keywords
Social Interaction Body Movement Systematic Change Slow Rotation Distinct KindAbbreviations
- BO
body
- CF
compensation factor
- LE
left eye
- RE
right eye
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