Abstract
Experiencing and viewing emotional states has been linked to systematic changes in frontal brain asymmetry responses. In infants and adults, greater left frontal asymmetry indexes approach tendencies, whereas greater right frontal asymmetry reflects withdrawal tendencies. However, little is known about what factors contribute to individual variability in emotional brain processes, especially during infancy. Previous research has identified a single-nucleotide polymorphism on the CD38 gene (rs3796863) linked to autism spectrum disorder, differences in oxytocin release, and attention to emotional faces in young infants. We therefore examined whether CD38 impacts prefrontal brain asymmetry responses to emotional faces.
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