title: Aversive second-order conditioning in the pigeon: elimination of conditioning to CS1 and effects on established second-order conditioning.
mesh_terms: D000818:Animals; D001245:Association Learning; D001362:Avoidance Learning; D010856:Columbidae; D003214:Conditioning, Classical; D005260:Female; D011939:Mental Recall; D012055:Reinforcement Schedule