| Abstract: | This article presents data from four independent studies on the relationship between quantity of maternal vocal stimulation during naturalistic conditions and 3-month-old infants' cognitive processing, as assessed by the infants' differential vocal responsiveness (DVR) to their mother versus a female stranger. In two of the studies, the subjects were full-term American infants whose parents came from a wide socio-educational and ethnic background. In the third study, the subjects were low-risk preterm infants of White American parents. In the fourth study the subjects were full-term infants in Greece. The results from all four studies showed a curvilinear relationship between DVR and maternal vocal stimulation during naturalistic conditions. High DVR was associated with a mid-level amount of maternal vocal stimulation, whereas low DVR was associated with both least and most maternal vocal stimulation. These studies raise the question of possible adverse effects of social overstimulation on infant development. |
