Visual processing and infant ocular Latencies in the overlap paradigm.

Young infants have repeatedly been shown to be slower than older infants to shift fixation from a midline stimulus to a peripheral stimulus. This is generally thought to reflect maturation of the neural substrates that mediate the disengagement of attention, but this developmental difference may also be attributable to young infants' slower processing of the midline stimulus. This possibility was tested with 3- and 7-month-old infants in 2 experiments in which the degree of familiarity of the midline stimulus was manipulated across repeated trials. The results of these experiments demonstrated that the processing of midline content does affect infants' ocular latencies to a peripheral stimulus but that developmental differences in such processing do not account for developmental differences in disengagement seen across the 1st year.