Examined the origins of high general cognitive ability (g) in twins who were participating in the MacArthur Longitudinal Twin Study. Formed high g groups from the 19th percentile and above at each age. Results suggested increasing genetic influence and increasing genetic stability from 14 to 36 months and substantial genetic influences with…

Examined relations between maternal control and evaluative feedback during the second year of life and children's mastery motivation and expressions of self-evaluative affect a year later. Found that negative maternal evaluations at 2 years related to children's later shame, especially when linked to children's actions or products. Positive…

Tested predictions of infantile amnesia theory compared with social-interactionist account of autobiographical memory. Found maternal reminiscing style and self-recognition when child was 19 months old uniquely predicted children's shared memory reports across time, even with children's initial language and nonverbal memory factored out.…

This study examined the relation of visual self-recognition to personal pronoun use and pretend play. For a longitudinal sample (N66) at the ages when self-recognition was emerging (15, 18, and 21 months), self-recognition was related to personal pronoun use and pretend play such that children showing self-recognition used more personal pronouns…

How various types of repetition influence the development of memory for real-world events was investigated in a naturalistic case study of a 2-year-old's autobiographic memories as revealed in mother-child conversation recorded when the child was between 21 and 27 months of age. Two types of repetition were studied: repeated recall of the same…

Task-centered interactions of 12 mother-infant pairs observed between the infants' 14th and 22nd month indicated that infants become aware of their competence in their second year. Five critical aspects of the children's behavior are discussed with respect to mother's influence, action as context for competence, and developmental characteristics…

Errors in naming pictures were studied for 12 children followed from age 15 months to 22 months and for 60 children of similar ages at three different levels of vocabulary development. An increase in naming errors was found with sudden increases in productive vocabulary, suggesting interference from previously retrieved words. (SLD)

Two cohorts of same-sex twin pairs were assessed on grammar and vocabulary. Findings indicated that vocabulary and grammar correlated strongly at 2 and 3 years in both cohorts, with a consistently high genetic correlation between vocabulary and grammar at both ages. Findings suggest that the same genetic influences operate for vocabulary and…

Investigates the relationship between 24 children's experiences in their second year, their mental and emotional disposition before and after the second year, and their motivational competence. Type and quality of experience were related to mental and emotional disposition. (RJC)

Results of a longitudinal study of seven children under age two suggest that variation in children's early word combinations can be explained in terms of different routes to multiword speech; and a strategy involving the breaking down of originally unanalyzed phrases may be used by all children in varying degrees. (Contains 22 references.)…

Study assessed compliance and internalization for 99 preschoolers previously studied as toddlers. Compliance and internalization were assessed in multiple observational contexts using maternal reports. Found that committed and situational compliance had distinct developmental trajectories, and only committed compliance was associated with…

This study shows that the noun bias in early vocabularies rests only in part on the acquisition of object names. An analysis of vocabulary composition from 45 children at I;8 indicates that more nouns are acquired than all other word classes but that only about half of the nouns acquired are the names of basic level object classes (BLOCs). (KM)

A longitudinal study examined the role of a mapping system in 2-year olds' learning of color and size words. Results indicated that the children acquired color maps in a characteristic order and showed a different acquisition pattern for size words. Results suggest that learning word associations may promote color-word acquisition; learning color…

Evaluated changes in mothers' interactive behaviors with infants from 6 to 40 months who were medically high risk, medically low risk, very low birthweight preterm, or full-term. Found that variations in mothers' responses to children's changing capabilities predicted rates of change in children's social skills. (Author/KB)

This study used longitudinal productivity criteria to establish the phonetic skill of 20 children (followed from 9 to 16 months). The number of specific consonants produced consistently across the months predicted referential lexical use at 16 months. Prior use of at least two supraglottal consonants characterized the children achieving…