While young infants can tell apart both individual human faces and individual monkey faces, older infants show a decline in the ability to tell monkey faces apart but an improvement at distinguishing between human faces.This is an example of:

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Perceptual narrowing refers to the developmental process by which a child's perception becomes increasingly specialized and attuned to the specific features of their own species, resulting in a decline in their ability to differentiate between faces of other species. This explains why older infants show a decline in their ability to tell monkey faces apart, but an improvement in distinguishing between human faces.

While Young Infants Can Tell Apart Both Individual Human Faces