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. 2006 Jul;86(1):65–80. doi: 10.1901/jeab.2006.67-04

Fig 7. Percentage of correct responses in the third symmetry test by each pigeon in Experiment 2, after having been trained in the 2S2C procedure.

Fig 7

The bars in white illustrate the symmetry results for those pigeons that had not reached the required discrimination index after the 2S2C conditional discrimination training phase.