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. 2010 Nov;94(3):267–282. doi: 10.1901/jeab.2010.94-267

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Fig 6 — Comparison pecks/sec (± 1 SEM) on form-oddity baseline trials (open circles) and non-reinforced reflexivity probe trials (filled circles) averaged over the subsequent 10 consecutive test sessions for each Group Oddity 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 pigeons OREF1 and OREF5 differs from that for pigeons OREF2 and OREF6.