Two experiments examined changes in the search of infants aged six, seven, and eight months. Experiment 1 found that the majority of infants displayed transitional search before intentional search. Experiment 2 showed that the infants' awareness of a hidden object develops gradually. (Author/RH)

When not socially engaged, children showed a significantly greater percentage of reoriented attention during vocalizing than nonvocalizing periods. Findings confirm the existence of an attention/vocalization relation and are consonant with Greenfield's predictions about the nature of this relation. The relation held equally for prelinguistic and…

This article evaluates the "Frames, then Content" hypothesis for speech acquisition, which sees babbling as a direct result of producing syllabic "frames" by rhythmic mandibular oscillation with little of the "content" seen under mandible-independent control. Analysis of 6,659 utterances of 6 normally developing…

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…

Home movies of eight normal children and eight children later diagnosed as autistic were analyzed based on: (1) Piagetian criteria of sensorimotor development and semiotic functioning, and (2) developmental levels of action competencies. The age range covered was 4 to 42 months of age. The analysis showed that, from the second year of life, timing…