Conditioned Vocalizations as a Technique for Determining Visual Acuity Thresholds in Sea Lions
- 31 July 1970
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 169 (3944), 498-501
- https://doi.org/10.1126/science.169.3944.498
Abstract
Aerial visual acuity and underwater visual acuity were measured in two sea lions (Zalophus californianus) by training them to emit click bursts if they saw a striped target or to remain silent if they saw a gray target. The closest grating spacings that could be resolved both in air and under water subtended a visual angle of 5.5 minutes of arc at a distance of 5.5 meters.Keywords
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