Infants' mother–stranger discrimination at 3 months as a predictor of cognitive development at 3 and 5 years.

Utilized differential vocal response (DVR) to an interactive mother vs an interactive stranger to classify 12 3-mo-old male firstborn infants into either a high or low DVR group. The high DVR group responded significantly above base rate to stimulation by the mother and significantly below base rate to stimulation by the stranger, whereas the low DVR group responded at base rate to both mother and stranger. The high DVR group subsequently performed significantly better on both the Stanford-Binet Intelligence Scale at age 3 yrs and the Illinois Test of Psycholinguistic Abilities at 5 yrs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)