Verbal interactions of three 2-year-old boys attending a play group were analyzed from videotapes made approximately 8 months apart. During this period, rates of interaction increased significantly, speakers learned to select message content more appropriate to the listener, and participants learned to watch each other more often. (Author/JMB)

The verbal interactions of 20 mothers with their children, who were between 1.9 and 5.0 years old, were recorded and analyzed. (SB)

Compares two types of semantic development (the acquisition of disappearance words and success-failure words) to performance on two types of cognitive tasks (object-permanence and means-ends tasks) among infants. (HOD)

Examined relationships between early vocabulary composition, early language use, and properties of mothers' child-directed speech at 10 words. Found that, when the effects of the child on the mother at 10 words was controlled, there was a negative correlation between mothers' production of speech illustrating word boundaries and the percentage of…

Studied across a 16-month period, young children of deaf parents showed accelerated early language development, on the average producing their first recognizable sign at 8.5 months, their tenth sign at 13.2 months, and their first sign combination at 17.0 months. Findings are inconsistent with previously reported patterns of synchrony between…