Focuses on the question of whether developmental improvement in performance on cognitive tasks is abrupt or continuous. Explains three model-based approaches to this question, and stresses that research conducted in these approaches has indicated that developmental improvements consist of jumps through discrete states. Concludes that these results…

Highlights the findings of the study by Pollitt et al. in this monograph that nutritional supplementation has long-term consequences for cognitive development and that the relationship of nutrition to cognitive performance does not fit a main-effects model. Also reviews methodological and conceptual issues unresolved by the study; and discusses…

Finds Bloom and Tinker's description and measurement of active, integrated, and situated children to be a credible scientifically rigorous paradigm for language acquisition research. Highlights their use of the naturalistic, observational method to understand the changing patterns of integration and use of multifaceted abilities in child language…

In 2 studies, subjects between 7 and 16 years of age indicated predictions for the water level in a tilted container or the position of a plumb line. Found that sex differences were evident at all ages; task performance improved with age according to a discrete stage process; and task performance was determined by field effects and rule strategy.…

Reviews issues of reliability (especially test-retest reliability) in newborn assessment, discusses predictive models based on newborn assessment, and presents information on modifications of the Brazelton Neonatal Behavioral Assessment Scale which may help in pursuing fruitful questions involving prediction of development. (Author/BH)

Discusses the role and limitations of the Brazelton Neonatal Behavioral Assessment Scale in the continuing effort to construct an adequate account of infant development. (BH)

Speculates on underlying processes for the reaction time variance and age differences in anticipation latency using the Visual Expectation Paradigm. Discusses the dichotomization of reactive and anticipatory behavior, limitations of longitudinal designs, drawbacks in using standard procedures and materials, and inferences that can be made…

Describes the conceptual model of newborn organization underlying the Brazelton Neonatal Behavioral Assessment Scale (NBAS). Argues that while the NBAS allows for the identification of an individual's behavioral repertoire, attempts to synthesize the resulting data have been plagued with difficulties. Briefly outlines an alternative model for…

Identifies contributions of Liben and Bigler's studies to gender development related to measuring self and other sex typing, developing a theoretical account of the self-other relation, and incorporating individual differences. Raises questions about measures used and interpretations of the findings. Suggests issues for future research:…

Examined 2-year-olds' language acquisition with an emphasis on the agency and intentionality of the child. Concluded that development depends on the child's expression of intentionality by actions (performance), the essential tension between the child's engagement and effort, and the integration of linguistic, cognitive, and social aspects of the…