In a laboratory procedure, 66 infants of 12 months were given happy, fearful, and conflicting emotional signals by their mothers and fathers with reference to five unusual toy stimuli. There were marked differences among infants in their capacity for and style of coping with conflict. A variety of specific responses to conflict were observed. (RH)

Notes that the Piagetian perspective admits the existence of interindividual differences but interprets them as noise masking the universal logical succession of structures, whereas the differential perspective views development as consisting of "vicarious processes." Asserts that the main aim of the "procedural studies"…

In this study of the origins of individual differences in theory of mind (ToM), the Environmental Risk (E-Risk) Longitudinal Twin Study sample of 1,116 sixty-month-old twin pairs completed a comprehensive battery of ToM tasks. Individual differences in ToM were striking and strongly associated with verbal ability. Behavioral genetic models of the…

In Study 1, 10-, 13-, and 16-year-olds were assigned to conditions in which they were instructed to think logically and provided alternative antecedents to the consequents of conditional statements. Providing alternatives improved reasoning on two uncertain logical forms, but decreased logical responding on two certain forms; logic instructions…

Fourth through eleventh grade students evaluated single personality trait descriptions of hypothetical persons of their own sex. Results are discussed in terms of person-perception and social desirability theories of personality. (ST)

Results show individual differences in intelligence progressively stabilizing by school age, with each child following a distinct pattern of mental development. Monozygotic twins became increasingly concordant over an Hes and were closely matched on developmental trends. (Author/RH)

A referential communication task was used to compare the effects of linguistic structure on the encoding and decoding performances of 120 five- and seven-year-old children. Results suggested that differences in adjective ordering rules and stylistic variation affect encoding and decoding accuracy. (Author/MP)

Children 10 to 14 years of age tried to identify and remember words presented visually with a backward mask. On different tasks, children recalled freely or serially, recognized by making a rapid forced-choice response, or simply named words as they were presented. Results were interpreted as identifying two sources of developmental and individual…

If human cognitive development advances through a series of broad and general stages, then the child's mind at any developmental point should seem consistent and similar across situations in its maturity level and general style. However, there appear to be factors and conditions that promote homogeneity and heterogeneity in the child's cognitive…

Sixteen children at each of ages two, three, and four years were observed being approached by and interacting with a friendly stranger during their mothers' presence and absence. While analyses of discrete behaviors yielded results consistent with those of earlier studies, analyses based on a behavioral systems approach identified age and…

Examined 245 third- through sixth-graders' relational aggression, overt aggression, prosocial behavior, and social adjustment at three points during the academic year. Found that individual differences in relational aggression were relatively stable over time, and that relational aggression and prosocial behavior contributed to the prediction of…

Findings indicated a significant interaction between activity level and intensity of stimulation in predicting exploratory competence and total exploration among 52 toddlers of 15 months of age who were observed in their homes 6 times over a 4-week period. (RH)

Among 120 fourth and sixth graders, correlations between intelligence scores and agency beliefs for effort decreased with increasing levels of reasoning about effort and ability. Correlations between intelligence scores and agency beliefs for ability increased with increasing levels of reasoning. (RH)

Investigated variables which influenced viewing of "Sesame Street" by 326 children aged 3 and 5. The most important determinants of individual differences in viewing within age groups were the structure of the family and the family's relation to outside institutions. (RJC)

Assessments of temperament, emotion, cognition, and language acquisition were obtained for 200 pairs of 14-month-old twins. Comparisons between the assessment correlations for identical and fraternal twins indicated an influence of genetics on inhibition, activity, temperament, empathy, negative emotion, spatial memory, categorization skills, and…