Journal
VISION RESEARCH
Volume 48, Issue 2, Pages 304-315Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.visres.2007.11.012
Keywords
harbor seal; Phoca vitulina; optokinetic nystagmus; eye movements; motion vision
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Harbor seals experience motion due to self-motion and to movement in the external world. However, motion vision has not been studied vet in marine mammals moving in the underwater world. To open up this research, optokinetic nystagmus (OKN) as a basic motion sensing and retinal image stabilizing reflex was studied in four harbor seals during stimulation with moving black-and-white stripe patterns. All seals responded with optokinetic, eye movements. Detailed measurements obtained with one animal revealed a moderate gain for horizontal binocular OKN. Monocularly stimulated, the seal displayed a symmetrical OKN with slightly stronger responses to leftward moving stimuli, and, surprisingly, a symmetrical OKN was found in the vertical domain. (C) 2007 Elsevier Ltd. All rights reserved.
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