Some 96 fourth-grade boys participated in a study investigating the influence of personality and stimulus characteristics on perceptions of the meanings of verbal evaluations, and the functioning of differentially perceived evaluations as reinforcers in a learning task. Personality variables measured were anxiety, locus of control, need for…

One control group and eight experimental groups, each composed of 12 first grade children, participated in this experiment. It was designed to investigate the effects of frequency of reinforcement and repeated evaluation of stimuli on the conditioning of preferences. Each child participated in the experiment for seven consecutive school days. The…