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Direct linkFogel, Alan; Hsu, Hui-Chin; Shapiro, Alyson F.; Nelson-Goens, G. Christina; Secrist, Cory – Developmental Psychology, 2006
Different types of smiling varying in amplitude of lip corner retraction were investigated during 2 mother-infant games--peekaboo and tickle--at 6 and 12 months and during normally occurring and perturbed games. Using Facial Action Coding System (FACS), infant smiles were coded as simple (lip corner retraction only), Duchenne (simple plus cheek…
Descriptors: Infants, Play, Nonverbal Communication, Games
