Differences in 3-month-old infants' vocal responsiveness to vocal-visual stimulation by mothers and strangers has been shown to be related to performance on both the Stanford-Binet at 3 years of age and the Illinois Test of Psycholinguistics at 5 years of age. The present retesting of 12 of the original 14 normal, first-born male subjects, now 12 years old, shows that their differential vocal responsiveness (DVR) scores at 3 months of age are related significantly to performance on such linguistic-academic tests as the Wechsler Intelligence Scale for Children-Revised (WISC-R) verbal scale, the Wide Range Achievement Test (WRAT) Arithmetic and Reading subtests, and the Peabody Picture Vocabulary Test (PPVT), but are not related to performance on such non-verbal tests as the WISC-R Performance scale. It is concluded that the social discrimination ability of the infant, that is, the perceptual-cognitive ability to respond with excitement to the mother and to withhold responsiveness to the stranger, is of predictive value for later verbal-cognitive functioning. In contrast, the subjects' performance on the Gesell, a test that measures early psychomotor skills, did not correlate with later verbal-cognitive and academic skills, but did correlate significantly with non-verbal cognitive skills. (Author/RH)