title: B. F. Skinner's verbal behavior: a retrospective appreciation.
mesh_terms: D004193:Discrimination Learning; D006666:History of Medicine; D049673:History, 20th Century; D006801:Humans; D007721:Knowledge of Results, Psychological; D009042:Motivation; D012057:Reinforcement, Verbal; D013850:Thinking; D014705:Verbal Behavior