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Infants generally begin to recognize emotional expressions after 6 months of age; some reports have even observed recognition in neonates. Emotional recognition is important for social referencing, in which infants "read" their parents' expressions to understand events. Three methods for studying how infants come to recognize emotion are described in this article: peek-a-boo, matching faces and voices, and multimodal presentation.
Arlene S. Walker‐Andrews (Sun,) studied this question.