Three different handbooks from child psychology, whose publication dates span 40 years, and a handbook on the psychology of aging were subjected to quantitate and qualitate comparative analyses. (Author/MB)

Contrasts work of Leontiev and Vygotsky. Suggests that Leontiev concentrated on social activity as a whole, whereas Vygotsky made semiotic mediation through culturally developed symbols a central aspect of his analysis. Maintains that they shared a philosophical base and that Leontiev used Vygotsky's ideas as a starting point to explore human…

Criticizes the operant approach to the study of life span development from a theoretical behaviorism view. It is argued that the operant approach is too limited in its scope to enhance significantly the conceptualization and understanding of life span development. (Author/DB)

Examined U-shaped development of graphic symbolization in children and in nonartist and artist adults. Found that drawing scores of adult artists did not differ from those of youngest children and artist adolescents, with a developmental sequence in acquisition of the ability to construct referential connections underlying visual metaphors.…