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Visual Bar Length Discrimination Threshold in the Pigeon

SCHWABL, U . and J . D. DELIUS. 1984. Visual bar length discrimination threshold in the Pigeon. Bird Behaviour 5: 118121. Using an instrumental discrimination conditioning procedure, it is found that Pigeons can distinguish visually between bars differing in length by less than 20/0 (Weber fraction = 0 .02). Pigeons are thus capable of a visual length discrimination performance that is superior to that of humans.