title: Effects of early experience and testosterone on song as a reinforcer.
mesh_terms: D000818:Animals; D001307:Auditory Perception; D001717:Birds / Q000254:growth & development*; D003216:Conditioning, Operant / Q000187:drug effects*; D004777:Environment; D006799:Housing, Animal; D008297:Male; D009043:Motor Activity; D010648:Phenylacetates; D011187:Posture; D012054:Reinforcement, Psychology; D012621:Seasons; D013637:Tape Recording; D013739:Testosterone / Q000494:pharmacology*; D014828:Vocalization, Animal
chemical_list: D010648:Phenylacetates; D013739:Testosterone