Red colobus monkeys are playful primates, making them an important species in which to study animal play. The author examines play behaviors and responses in the species for its play initiation events, age differences in initiating frequency and initiating behavior, and the types of social play that result from specific initiating behaviors. Out…

Many students struggle with statistical concepts such as interaction. In an experimental group, participants took a paper-and-pencil test and then were given training to establish equivalent classes containing four different statistical interactions. All participants formed the equivalence classes and showed maintenance when probes contained novel…

The current work reports 2 experiments that investigate the development of false belief from the perspective of Relational Frame Theory. The true and false belief test protocol used across both experiments contained a range of tasks that involved responding in accordance with the 3 perspective-taking frames of I-YOU, HERE-THERE, NOW-THEN, and in…

Reports on three studies designed (1) to determine whether the relationship between age and exploratory behavior varies as a function of the measure used, and (2) to examine any sex differences in exploratory behavior. (SB)

This study of 68 girls in a sports-with-prizes treatment indicated that children can be induced to behave generously, even after a lapse of time, in proportion to the amount of modeled generous behavior they see. Older children and children experiencing success were more generous. (SJL)

Recent theoretical analyses have implied that there may be age differences in children's tendency to exercise component selection, i.e., to attend selectively to a single component of stimulus objects in a learning situation. In the present study, 6 experiments were conducted, each designed to investigate developmental changes in component…

Applies a suicide trajectory model to rates of suicide and attempted suicide to explain commonalities and age differences in risk factors affecting suicide across the life span. (HTH)

Self-report data were collected from 100 enuretic children between the ages of 5 and 14 to determine how they viewed their incontinence problem. Although the children were generally unhappy with their wetting, they had a relatively positive view of self and did not exhibit an excessive number of behavior problems. (HOD)

This paper reviews a number of studies that have tested Fiedler's (1964) Contingency Model and Least Preferred Co-Worker Scale of leadership style and effectiveness, focusing on studies that have examined the characteristics and stability of this scale across age, ethnicity, and gender. The Contingency Model is based on three determinants of…

The purpose of this book is to report and interpret a group of research studies relating to social-cognitive development in early childhood through adolescence. Adults interpret the covert psychological properties of other people, their abilities, knowledge, motives, attitudes, perceptions, and intentions relevant to concrete situations. An infant…

Improving the services for children with emotional or behavioral problems has been one of the priorities of the Department of Education for the last four decades. Since its implementation, the Office of Special Education Programs has been dedicated to funding and supporting research in the area of emotional disorders. Despite increased attention…