One hundred and sixty subjects from five age levels ranging from 3 to 20 years compared photographs of dogs (e.g., two different Great Danes or a Great Dane and a Doberman pinscher) and judged whether they were similar or different. (Author/MP)

The question of whether or not a certain mathematical model is applicable to the paired-associate data of preschool children as well as adults was examined in five experiments. (Author/MP)

The relationship between children's concepts of life and their judgments and revisions of sentences with violations of animacy restrictions was examined. (Author/MP)

Four-month-old infants' stimulus preferences were assessed using an operant paradigm with mobile reinforcers of different colors (blue, green). (Author/MP)

Investigates which aspects of the mother behavior in interaction would be related, and in what way, to the child's acquisition of number conservation as a criterion measure of later cognitive development. (MP)

Assesses whether a model of at least two levels of perspective-taking ability beyond egocentrism provides a more adequate account of the variance in subjects' responses across perspective-taking tasks. (Author/MP)

Convergence between temperament ratings from two different sources (mothers and observers) and observer codings of peer-peer interaction was assessed. (Author/MP)

Activity level was measured by two independent methods, a mechanical recording device and teacher descriptions, in a sample of 129 children (65 boys and 64 girls), participating in an ongoing longitudinal study. (Author/MP)

Relationships between day care and attachment were assessed with alternative procedures: (1) hypothesized normal patterns of attachment were tested naturalistically in day-care centers; (2) day-care and home-reared children were compared in a laboratory setting. (Author/MP)

The purposes of this present study are (1) to follow the development of preterm as compared with that of full-term infants born to teenage v adult mothers belonging to a lower SES group; and (2) to assess the effects of an intervention provided for a subsample of the preterm infants born to teenage mothers. (Author/MP)

Interaction during feeding sessions between preterm infants (N=21) and their mothers and interaction between full-term infants (N=22) and their mothers were compared. Mothers and babies were from a low-income, inner-city population. (Author/MP)

The dyadic controls of the social interchange patterns of 12- to 42-month-olds (N=27) with their different social partners is the focus of this study. (Author/MP)

Investigates the exploratory behavior of young children as it relates to individual differences in curiosity, the novelty of the objects explored, and the interactive style employed by an adult experimenter. (Author/MP)