In this study, we address the construction of the first symbolic uses of objects in contexts of triadic interaction (adult-child-object). We assume that symbolic productions are based on public rules of the use of objects previously agreed by the community. The first symbols are not rooted in any literal, evident reality, but in shared rules of…

Developmental trajectories provide the empirical foundation for theories about change processes during development. However, the ability to distinguish among alternative trajectories depends on how frequently observations are sampled. This study used real behavioral data, with real patterns of variability, to examine the effects of sampling at…

Reports a semilongitudinal study which measured the respiratory activity during crying of 10 normal infants aged two days to eight months. (BD/BR)

A theory of infant skill acquisition was supported by observations, over a six-week period, of the bouncing activity of eight infants while they were supported in a harness assembly. Observed three stages of activity: an initial assembly stage, when movement was irregular and variable in period; a tuning phase of more periodic movement; a final…

Studied the ontogeny of walking by prelocomotor infants. Results support a dynamic systems view of development and the view that upright locomotion emerges from the self-organization of multiple cooperating elements rather than as a result of a preexisting neural code. (Author/GR)

Sixty-four mother-infant pairs were videotaped during structured episodes in which the mother challenged the infant to use her instrumentally to get access to or to operate a toy. At age 6 months the infants could use their mothers instrumentally in 36% of the episodes, increasing to 67% at 9 months and 78% at 13 months. (MDM)

Many studies using questionnaires and observational methods to collect information on the pointing gesture in infants have recently been performed. However, no study based on long-term observation is presently available that deals with the appearance and development of pointing as an interaction between mothers and their children. Therefore, this…

Investigated developmental change in symbolic representational ability by examining infants' imitation of vocalizations, words, visible motor actions, and nonvisible motor behaviors at ages 10, 13, 17, and 21 months. Results revealed a pattern of increasing imitation, supporting the view that a domain-independent representational capacity develops…

Attempts to determine whether infants' performance in two search tasks is related to their entry into Stage 6 of object permanence development (thereby testing Piaget's claim that only Stage 6 infants possess the capacity for representation). (BD)

Adopts a longitudinal design to track mother-child developmental change in infant task-related mastery and concomitant maternal behavior. Finds that, as infants gain more mastery across time, mothers gradually withdraw support in terms of concrete, specific and nonverbal means of instruction. Results support a one-step-ahead model for maternal…

Behavioral patterns and problems of 159 first-born infants and their mothers were studied at birth, 2-months, and again at the age of 18 months. Journal availability: J. B. Lippincott co., E. Washington Square, Philadelphia, Pennsylvania 19105. (Author/PHR)

Explored relation between infants' early spontaneous imitation of novel and familiar words and subsequent lexicons in longitudinal sample between 13 and 21 months. Found marked contrasts in quantity and proportions of nouns between reported and observed lexicons. When earlier vocabulary levels were controlled, infants' early replication of novel…

This study examined behavioral development during the first year of life of 41 infants diagnosed with cerebral palsy, hypotonia, or hypertonia. The KID Scale, an empirically normed, caregiver-report inventory which covers behavior in five domains (cognitive, motor, language, self help, and social) was administered at about 5, 9, and 12 months…

This longitudinal study of the development of nonverbal behavior in the first 3 years of a child's life focuses on four factors: the relation between physical and vocal interaction between the child and his mother, observed cuses which can be used to interpret the child's communicative intent at different age levels, frequency of occurrence and…

The purpose of this study was to cross-sectionally and longitudinally examine the developmental process of search behavior in infancy. Subjects were 23 Japanese normal infants (11 males and 12 females) who were individually tested once a month from the age of six to 13 months in laboratory settings. Small toys and three white opaque cubic boxes…