Comparison of 14 infants of highly educated mothers with 21 infants of less educated mothers indicated that infants' differential vocal responsiveness (DVR) to mother versus stranger was significantly higher among 3-month-olds with highly educated mothers, thereby suggesting that DVR is influenced by environmental factors. (RH)

Results of a series of studies suggested that excessive early vocal stimulation may be detrimental to infants' cognitive processing, and that optimal development may be associated with a moderate amount of early stimulation. Study 1 involved 59 3-month-old infants and their mothers. Study 2 observed 23 mothers and infants seen 3 months after the…

Explores the possibility of sex and socioeducational differences in young infants' patterns of vocal interaction with mothers and strangers at two and three months of age. Infants at both ages vocalized more to mothers than to strangers. (BB)

A study explored whether socioeconomic status (SES) differences could be detected in 3-month-old infants' differential vocal responsiveness (DVR) to mothers versus strangers. The study also explored whether 3-month-olds' DVR was related to environmental variables, such as the mother's behaviors toward the infant in naturalistic conditions, the…