Explored the roles of genes and environment in masculinity and femininity during pre- and early adolescence in 70 twins of 8-14 years. Results revealed significant genetic influences in all measures. Environmental influences were specific to each individual and not shared by members of the same twin pair. (RJC)

Compared effects of contingent and noncontingent adult-infant social interactions on subsequent infant-controlled habituation and choice tasks of 26 infants of 3 months. Infants who experienced a prior noncontingent social interaction tended to adopt response strategies that reduced the density of stimulation during subsequent nonsocial tasks.…

Explored the power of intonation of speech addressed to adults and preverbal infants to convey meaningful information to 80 adult listeners. Listeners used intonation to identify speaker's intent with greater accuracy in infant-directed speech than adult-directed speech. (RJC)

Investigated the effect of setting on the social referencing of 48 children of 6-40 months. Behavioral regulation was observed in familiar child care centers and an unfamiliar university laboratory. Affect was not influenced by setting and showed regulation only for the oldest children. (RJC)

Examined the relation between infant-sibling affective involvement and the attachment security of 1-7-year-old children of 53 mothers. Secure infants reacted less negatively than insecure infants when mothers turned their attention to an older child. (RJC)

Examined the effect of service dogs on the social acknowledgment of 5 disabled children of 10-17 years in shopping malls and school playgrounds. Social acknowledgments were more frequent when a service dog was present and more pronounced in shopping malls. (RJC)

Examined the visual scanning patterns of infants ages 6, 10, and 13 weeks who viewed static geometric figures. Measures of fixation dwell-times, saccade lengths, and the choices and sequences of saccadic targets revealed that, although younger infants demonstrated salience-guided scanning behavior, older infants increasingly utilized volitional…

Six experiments assessed young children's spatial orientation relative to their imagined surroundings. The experiments found that children as young as 3.5 years were able, like adults, to accurately walk along a path that replicated the route between their seat and the teacher's desk in their preschool classroom. (MDM)

Three studies examined preschool children's understanding of categorical hierarchies, testing their ability to form categories at different levels of generality and to include the same objects in multiple categories. Found that, contrary to the implications of previous studies, two- and three-year olds appear to have both categorization skills.…

Four experiments examined three- and four-year olds' interpretations of novel words applied to familiar objects in the sentence frame "This Y is X," where X is a novel word and Y is a familiar count noun. Results indicated that preschoolers understood that the novel words were either proper names or adjectives/mass nouns. (MDM)

Four experiments examined primary school children's confusion of /t/ and /d/ when spelling such words as "city" and "lady." They found that, until at least second grade, children often misspelled such flaps as /d/, with few children showing a bias toward /t/. Results indicated that young children are not purely phonetic spellers as they are often…

Four experiments with children aged 5 through 12 tested the relationship between short-term memory (STM) and processing capacity. The results suggest that effects obtained with STM span do not provide clear indications of overall working memory development, because STM span and the processing space component of working memory entail distinct…

Three studies examined young children's understanding that, if one "remembers" or "forgets," one must have known something previously. The majority of four-year olds, but not three-year olds, understood that, when two characters currently knew something, the one with prior knowledge remembered and that, when neither character currently knew…

Examined young British and Indian children's ability to distinguish between real and apparent emotion in response to stories involving child-adult and child-child interactions. Found that the younger Indian girls performed better than the younger British girls. Other age, gender, and cultural effects suggest a more social model of the…

Videorecorded stimuli were used to assess social information processing patterns in 3 domains (peer group entry, response to provocation, and response to authority directive) in 259 first, second, and third graders. Teacher and peer ratings of behavior competence supported the hypothesis that children's behavioral competence is a function of…