The old-style method of testing animals' eyesight is to train them to respond to certain visual stimuli. This is laborious, and in the case of some refractory creatures, such as snakes, frogs and Gila monsters, virtually impossible. At the University of Rochester a promising, extravagantly polite young scientist named John Warkentin is investigating animal eyesight with a more efficient technique which requires no training, last week made public some of his findings.
Prime piece of apparatus is a vertical, hollow cylinder, five feet high and four feet in diameter. On the inside wall of...
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