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Physiological responses of 5-month-old infants to smiling and blank faces.
Bazhenova OV, Stroganova TA, Doussard-Roosevelt JA, Posikera IA, Porges SW. Bazhenova OV, et al. Among authors: posikera ia. Int J Psychophysiol. 2007 Jan;63(1):64-76. doi: 10.1016/j.ijpsycho.2006.08.008. Epub 2006 Oct 23. Int J Psychophysiol. 2007. PMID: 17056142 Free PMC article.