Forty children each from nursery school, first grade, and third grade participated in a study of the use of symbolic mediators in the control of overt behavior of children with internal and external locus of control. Each child participated in three different verbal control tasks: a push-button task, a pounding-board task, and a serial-recall…

This study investigated whether mothers' responses to their infants' gestures play a role in their infants' vocabulary development. Eight infants were observed interacting at home with their mothers on 2 occasions, when the infants were 10 to 12 months old, and 16 to 18 months old. Videotapes of the observations were transcribed and coded for…

This paper investigates the development of negative Wh-questions in a four year old subject acquiring English as her L1. Spontaneous and elicited speech samples were collected over a period of 6 months. During the course of the study, the subject began to invert subject and auxiliary, and by the end of the study she was inverting correctly in 38%…