Reference
Strathearn, L., Li, J., Fonagy, P., & Montague, P. R. (2008). What’s in a smile? Maternal brain responses to infant facial cues. Pediatrics, 122(1), 40-51.
Centorrino, S., Djemai, E., Hopfensitz, A., Milinski, M., & Seabright, P. (2010). Honest smiles as a costly signal in social exchange. Behavioral and Brain Sciences,33(6), 439-439.
Ohala, J. J. (2010). What’s behind the smile?.Behavioral and Brain Sciences, 33(6), 456-457.
Strathearn, L., Li, J., Fonagy, P., & Montague, P. R. (2008). What’s in a smile? Maternal brain responses to infant facial cues. Pediatrics, 122(1), 40-51.