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Visual fixations of 3- to 5-week-old, 7-week-old, and 9- to 11-week-old infants were recorded as they scanned an adult's face which was stationary, moving, or talking. A dramatic increase in face fixations occurred between 5 and 7 weeks for all conditions. Talking produced an intensification of scanning in the eye area in the two older groups.
Haith et al. (Fri,) studied this question.