The data demonstrate the existence of a unified, negative cognitive content that is associated with depressed mood among normal subjects. Since cognition emerged as a more stable characteristic than affect, one might conjecture that the cognitive component is activated in--and perhaps triggers--the development of depressed mood. (Author)

The play behavior of young children is viewed as a behavioral manifestation of nonverbal thinking. Discussed are issues of relevance to the understanding of the development of thought in general and of the symbolic function in particular. A line of development is proposed which leads from early nonverbal thought as manifested in play, either…

Investigated the role of behavioral style and cognitive performance as predictors of cognitive development in extremely low-birth-weight children assessed at age 2 and again at age 4. Found stability of cognitive performance from 2 to 4 years of age; this as well as behavior style and orientation-engagement predicted subsequent cognitive…

This dissertation examines the thesis that it is the human language system which largely makes possible the human capacity for modifiability of responses called "intelligent" and "adaptive" modes of interaction with the environment. Chapter titles are (1) A Process View of Human Behavior, (2) Aspects of the Multi-Dimensional Nature of Cognitive…