Çorapçı F, Kancal S, Friedlmeier W, Charbonneau R, “Cultural variation in positive affect: Frequency of smiles and laughter among US and Turkish mother-toddler dyads”, 19th Biennial International Conference on Infant Studies , 2014, Almanya, 19th Biennial International Conference on Infant Studies , 0, 0, 2014.