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Comparison pecks/sec (± 1 SEM) on form-identity baseline trials (open circles) and nonreinforced reflexivity probe trials (filled circles) averaged over the subsequent 10 consecutive test sessions for each Group Identity pigeon. Matching = trials on which the comparison physically matched the preceding sample. Non-matching = trials on which the comparison did not physically match the preceding sample. Note that the ordinate for IREF3 and IREF5 differs from that for the other 3 pigeons.
