Abstract
The preceding studies report development of the technique whereby the infant controls stimulus availability, permitting the decrement and recovery of visual fixation to be used to study discrimination of visual stimuli and discrimination of auditory stimuli. The stimuli used in the study of visual discrimination were maximally different (a checkerboard and a baby), while the stimuli used in the study of auditory discrimination were the voices of two women reading the same poem and the same voice reading the same poem but with different tone qualities. Not only did the infants make that difficult discrimination, but other research (Eimas, Siqueland, Jusczyk, & Vigorito 1971; Moffitt 1971; Trehub & Rabinovitch 1972) indicates that young infants can discriminate among individual speech sounds. The question was raised whether young infants could make a visual discrimination analogous to the auditory discrimination reported by Boyd (Chap. VI). That is, could young infants discriminate between the pictures of two women, using the techniques developed in the Kansas laboratory. In 1968 Fitzgerald summarized the available data bearing on the question of discrimination as follows:
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