Results of training with breast histopathology samples at different magnifications and rotations.

A) When first trained with 4× magnification images the birds performed at chance levels of accuracy, but quickly learned to discriminate. Subsequently, when the birds were exposed to higher magnifications samples, their performance commenced at accuracies above chance (but below their final performance at lower magnification they had previously been exposed to), and improved further with training. B) Introducing rotated versions of the training stimuli did not significantly affect performance at any of the magnifications.