Assessed stressful life events and psychological symptoms of 211 children and young adolescents and their parents. Findings supported a model in which daily stressors mediated the relation between major life events and psychological symptoms for family members. (RJC)

Examined the relation of infant attention and memory to later cognition in 45 full-term and 46 high-risk preterm infants. Findings indicated a substantial relation between infant visual recognition memory and later intelligence. (RJC)

Studied 16 six-month-old infants to determine whether they organized speech categories around prototypes. Infants correctly sorted novel stimuli over 90 percent of the time. Generalization to novel members of the category was significantly greater after exposure to the prototypical exemplar. (RJC)

Explored relations between measuring procedures and reasoning about amount on the part of 36 children of 3-8 years in 2 studies. Transformation on a relevant measurement procedure predicted difficulty of transformation for a domain. (RJC)

Investigated egocentricity and ascriptions of knowledge to others in 45 children of 3-6 years. Six-year-olds were better than younger children at assessing the other's knowledge. Subjects were better at assessing the other's knowledge when their own access and knowledge were identical. (RJC)

Studied 237 fifth-, eighth- and eleventh-graders to determine their knowledge of effective strategies for dealing with everyday problems. Strategy effectiveness was dependent on the context of the problem. Age and gender differences were found when students' strategy knowledge was compared with that of teachers. (RJC)

Attempted to determine whether 170 third and sixth graders would benefit from the simultaneous use of 2 mnemonic strategies. Findings suggest that categorical sorting and active rehearsal combine to facilitate recall performance. (RJC)

Studied 60 adults to determine age differences in cohesion of narrative retellings in reference and conjunction discourse systems. Older adults scored significantly lower on the memory span measure, recalled less story information, and made more referential errors in retellings than younger adults. (RJC)

Studied 622 adults and 211 undergraduates to determine the relationship of perceptual speed and speed of marking psychometric answer sheets to individual differences in performance on psychometric tests. Findings suggest strong relationships between age, speed, and intelligence-test performance. (RJC)

Studied 1,1621 adults to determine whether psychometric tests would retain equivalent factor structures among samples widely differing in age. Results confirmed configural invariance for all subsets, but did not establish complete or incomplete metric invariance for any set. (RJC)

Studied individual differences in reactivity in 40 newborns. Measures of reactivity were related during the first two months of extrauterine life. (RJC)

Studied 7,018 children between birth and 7 years and 81 children of 5-8 years to test the hypothesis that birth order is negatively related to motor activity level. Activity level declined linearly across birth position, so that early-borns were rated as more active than later-borns. (RJC)

Ability of 26 newborns to imitate facial expressions was examined. When infants observed emotional facial expressions, they did not show imitative matching of the modeled expressions. However, when tongue protrusion was modeled, infants did produce the modeled gesture. (PCB)

Localization acuity was examined by determining the smallest sound shift off midline and along the horizontal axis that infants 6-18 months could reliably discriminate. As their age increased, infants demonstrated a finer partitioning of auditory space along the horizontal axis. (PCB)

The prosodic features of maternal speech to infants were measured quantitatively in a tonal language, Mandarin Chinese, to determine whether the features were similar to those observed in nontonal languages such as English and German. The pattern of results for Mandarin motherese was similar to that reported for other languages. (PCB)