Epstein (1974) claims evidence for regular two-year growth spurts in the development of brain and mind, a phenomenon he calls phrenoblysis. Unfortunately, repeated analysis of the data he presents as proof of his theory provides no support. (Author/RH)

Study attempted to determine the viability of optimal level theory as it pertains to infant perceptual and cognitive development. (Authors)

Results are discussed in terms of Piaget's concept of the parallel development of the cognition of the impersonal and interpersonal worlds. (Authors)

Conclusion drawn is that bilinguals, brought up in a one-person, one-language home environment, reach a stage in semantic development some 2-3 years earlier than their unilingual peers. (Author/CB)

Results are discussed in terms of cognitive growth, the psychoanalytic notion of ambivalence, the role of stimulus context in eliciting laughter or fear, and a possible adaptive, stimulus-maintaining function of laughter. (Authors)

It is suggested that altruism is a multidimensional concept and that in the young child its expression may in part reflect differing levels of cognitive development. (Authors)

Study tests four predictions derived from Piaget's cognitive theory. (CB)

The most significant finding is that classification according to complete similarity not only occurs much earlier than reported by Inhelder and Piaget, but also does not follow the developmental course reported by Inhelder and Piaget. (Author)

Outerdirectedness has been defined by first author and his colleagues as a style of problem solving characterized by reliance on concrete situational cues rather than by active attempts to deduce abstract relationships. (Authors/MB)

A combination of readiness and body-part training was the most effective in producing number conservation with external objects. (Authors)

Suggests ways to use dynamic systems analysis to illuminate the pluralistic and multidimensional model described by Larivee, Normandeau, and Parent (2000). Issues discussed include the characteristics of developmental transitions, such as hysteresis; nature of growth processes, such as hierarchical development or predator-prey interactions; and…

Results are discussed in terms of variables which may lead to the activation of cognitive structures during the transitional period. (Authors)

While father absence due to divorce, desertion, or separation had the most negative influence in the initial 2 years of the child's life for boys and girls, father absence due to death was the most detrimental when it occurred in the 6 - 9 period of the boy's life. (Author)

The present study is based on a form of task analysis that explicates in detail the hypothesized solution behavior of skilled performers of the task. (Authors)

Implications of this study on child-development theory, education, and psychotherapy are discussed. (MB)