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In the present study, pigeons were trained under binocular conditions in a conditional visual discrimination in which they were faced with two identical patterns arranged one above the other. In half of these stimulus pairs the animals had to peck the upper pattern, in the other half the lower one. Although only six pairs of stimuli were used, only four out of eight birds reached learning criterion...
Functional cerebral asymmetries, once thought to be exclusively human, are now accepted to be a widespread principle of brain organization in vertebrates [1]. The prevalence of lateralization makes it likely that it has some major advantage. Until now, however, conclusive evidence has been lacking. To analyze the relation between the extent of cerebral asymmetry and the degree of performance in visual...
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