In-air visual acuity of the bottlenose dolphin.

@article{Pepper1973InairVA,
  title={In-air visual acuity of the bottlenose dolphin.},
  author={Ross L. Pepper and John Vincent Simmons},
  journal={Experimental neurology},
  year={1973},
  volume={41 2},
  pages={
          271-6
        }
}
Abstract Using the method of constant stimuli, horizontal black and white line gratings were presented to a bottlenose dolphin in a successive discrimination task. Over a constant viewing distance of 2.8 m, a minimal visual angle of 18 min of arc was obtained. This value is poorer than that reported for pinnipeds, but comparable to functions reported for the antelope, elephant, and clawless otter. 

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