{"title":"Variability in medial prefrontal cortex responses to smiles in human infants is linked to genetic variation in the oxytocin system.","authors":"Tobias Grossmann","doi":"10.1080/17470919.2026.2686726","DOIUrl":null,"url":null,"abstract":"<p><p>Smiling plays a critical role in guiding behavior during social interactions from early in human ontogeny. The current study examined whether genetic variation in the oxytocin system is linked to individual differences in medial prefrontal cortex (mPFC) responses to smiles in human infants. Results show that genetic variation in <i>CD38</i> (rs3796863), linked in prior work to variation in oxytocin release, is associated with enhanced mPFC responses when 7-month-old infants were viewing smiles, but not when viewing angry or fearful faces. These findings provide novel evidence that oxytocin-related genetic variability contributes to early-emerging differences in social brain function and support the view that variability in processing of affiliative signals is influenced by neurogenetic mechanisms from early in human ontogeny.</p>","PeriodicalId":49511,"journal":{"name":"Social Neuroscience","volume":" ","pages":"119-126"},"PeriodicalIF":2.0000,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Social Neuroscience","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1080/17470919.2026.2686726","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/6/8 0:00:00","PubModel":"Epub","JCR":"Q4","JCRName":"NEUROSCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Smiling plays a critical role in guiding behavior during social interactions from early in human ontogeny. The current study examined whether genetic variation in the oxytocin system is linked to individual differences in medial prefrontal cortex (mPFC) responses to smiles in human infants. Results show that genetic variation in CD38 (rs3796863), linked in prior work to variation in oxytocin release, is associated with enhanced mPFC responses when 7-month-old infants were viewing smiles, but not when viewing angry or fearful faces. These findings provide novel evidence that oxytocin-related genetic variability contributes to early-emerging differences in social brain function and support the view that variability in processing of affiliative signals is influenced by neurogenetic mechanisms from early in human ontogeny.
期刊介绍：
Social Neuroscience features original empirical Research Papers as well as targeted Reviews, Commentaries and Fast Track Brief Reports that examine how the brain mediates social behavior, social cognition, social interactions and relationships, group social dynamics, and related topics that deal with social/interpersonal psychology and neurobiology. Multi-paper symposia and special topic issues are organized and presented regularly as well.
The goal of Social Neuroscience is to provide a place to publish empirical articles that intend to further our understanding of the neural mechanisms contributing to the development and maintenance of social behaviors, or to understanding how these mechanisms are disrupted in clinical disorders.
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