Abstract
Four blackbirds were trained to make a simultaneous discrimination learning of two complex shapes. All subjects readily mastered the discrimination task. They were then tested for generalization with 20 other paired shapes. In transfer tests, visual recognition remained invariant despite alterations of size, presentations of right, left, upper or lower halves of figures, local distortions, segmentation and camouflages. On the other hand, there was no longer any visual recognition with brightness inversion, rotation or dotted outlines of figures. Our results show that blackbirds perceive and memorise a topographic description of two complex shapes, provided that their orientation is not modified.
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