Two hundred seventh grade Ss were administered a paired comparison scale for the purpose of predicting reinforcer effectiveness of fifteen stimuli. (Authors)

Study found that nonlearners, as well as learners, were unquestionably utilizing strategies at a rate greater than that expected on the basis of chance alone. (Authors)

Results confirmed previous findings that response speeds would be faster following an 18- than a 8-second stimulus duration. (Author)

The acquisition of aggressive responses may likely be a function of the environment's copious provision of imitative models. (Author)

Describes an investigation which was designed to probe the extent to which environmentally concerned citizens share general patterns of ideological and demographic characteristics. Discusses implications, in terms of need to unify a diverse constituency, so as to strengthen the ecology movement. (LK)

The results of four experiments comparing the behavior of children from two settings are reported in this article. (Authors)

Results demonstrate that 12 - 15 - week-old male infants smile to nonsocial stimuli, and offers support for the recognition hypothesis of infant smiling. (Authors/MB)

Mothers of 232 pairs of twins were interviewed periodically about the similarities and differences in behavior displayed by their twins during infancy and early childhood. (Authors)