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Comparison pecks/sec (± 1 SEM) on form-identity baseline trials (open circles) and nonreinforced hue–hue probe trials (filled circles) averaged over test sessions for each Group RF pigeon in Experiment 1. Matching = trials on which the comparison matched the preceding sample. Nonmatching = trials on which the comparison did not match the preceding sample. Note that the ordinate for 2 of the pigeons (RF1) and RF3) differs from the other 2.
