Mice from replicate lines, selectively bred based on high daily wheel-running rates, run more total revolutions and at higher average speeds than do mice from nonselected control lines. Based on this difference it was assumed that selected mice would find the opportunity to run in a wheel a more efficacious consequence. To assess this assumption…

Response to article in previous issue by Max Bruck (April 1968). Argues that behavioral approach has been empirically demonstrated to be effective in altering problem behavior, and offers advantages over more traditional approaches. Proposes that behavioral psychology can deal with all important aspects of complex human behavior. (Author)

It is suggested that the theory of behavior based on conditioning processes can be reconciled with new data, but only by revising certain tacit behaviorist assumptions about the parameters of the conditioning process. (Author/AM)

The study compared the efficacy of proclamation, contracting, and contingent teacher approval in modifying the classroom behavior of 5 Negro adolescents. Proclamation consisted of a written statement of reward and punishment contingencies (points gained or lost) under which the class was operating, whereas the contracting phase permitted students…