Research supported in part by the National Institute of Mental Health. Reprints from Kenneth Heller, Dept. of Psychology, Indiana University, Bloomington, Ind.

Results of a study designed to determine whether the activation of one of the bilingual's language systems makes the other system inoperative. (Author/FWB)

Argues that reliance upon verification procedures has inhibited theory building in communication. Advances four falsification procedures and presents examples from communication studies. Offers several implications these procedures have for empirical research in communication. (PD)

Considers the potential value of two bodies of thought arising from work on animals in connection with rehabilitating abnormal behavior. One deals with the processes of catch-up and self-regulation, the other with optional periods of learning in development. (MP)

Cites the importance of computers and of mathematical graph theory in describing the key features of group structures and compares research based on these methods to research carried out by social psychologists in the 1940s and 1950s. Identifies major problems in the collection of network data about large groups whose boundaries are not…

Studies in applied behavior analysis have used two expressions of reliability for human observations: percentage agreement and correlational techniques (including the phi coefficient). Formulas for converting percentage agreement scores to phi coefficients and vice versa are presented. (Author/RL)