Presents nine experimental studies investigating auditory and visual discrimination in very young infants. Results are discussed in terms of their implications for understanding habituation, cross-modal stimulation, receptive language development, and individual differences. Appendices include data on visual fixation duration and information on…

This study investigated at the age at which infants become able to discriminate between their mothers and females strangers, as measured by differential patterns of pauses during the infants' crying while being spoken to by their mothers and female strangers. The subjects, 14 infants ranging in age from 7 to 20 days, were fed, burped, and changed,…

THE BASIC INTENTION OF THE STUDY WAS TO INVESTIGATE MENTAL RETARDATION IN TERMS OF PERCEPTUAL AND RESPONSE ABILITY DEFINITIONS, TO TEST THESE ABILITY DEFINITIONS OBJECTIVELY, AND TO EVALUATE THEM AS THEY RELATE TO THE INTELLIGENCE FACTOR. BOTH PERCEPTUAL AND RESPONSE FACTORS WERE EXAMINED FROM THE STANDPOINT OF MENTAL DISTURBANCES WITH REFERENCE…

This study investigated the response behavior of nine infants, aged 13-15 weeks, to a recurrent pattern of visual and verbal stimuli presented by their own mothers and by female strangers. The infants were presented with the following 2-minute sequence (repeated 3 times): (1) one-half minute of an unknown female leaning over the crib with a…