The acquisition of the copula and auxiliary "be" forms of "am,""is," and "are" was studied with 16 children. Spontaneous social speech samples were obtained from each child. One child's speech was sampled for approximately one hour per week from age 2;5 through 4;0, and for one-half hour per week from age 4;1 to 5;0. A second child's speech was…

The ontogenetic development of human vocal utterances and their role in early interaction processes were studied with a three-month-old baby. Recordings were made of infant vocalizations in the home and the sounds were classified. During a five-minute segment between the mother and infant, the infant produced 59 utterances, 93 percent of which had…

The question of whether children's accentuation strategies are determined by the linguistically established context was studied. A second investigation determined whether the difference between distinctive and nondistinctive information is marked by the speaker's accentuation, focusing the listener's attention upon the crucial information. In the…

The range of meanings of "big" and "little" that mothers and their three children under age two expressed in relatively natural communication situations was studied. Longitudinal data from transcripts of conversations of middle-class mothers and their children were analyzed along with diary records kept by parents of their children's use of size…