Shape oddity recognition by pigeons is independent of shape orientation

Abstract

Pigeons that had been trained to perform in a conditional oddity-from-sample discri­mination paradigm using one collection of stimuli were tested for transfer of performance with novel sets of stimuli. In these tests the orientation of sample and comparison shapes differed by 0 0 , 90 0 , 180 0 and 270 0 • The pigeons showed transfer at a high level of accuracy. They were not affected in their performance by the degree of orientation disparity between sample and comparison patterns.