Social Smiling and Laughter Are Linked to Enhanced Functional Brain Connectivity in Young Infants' Default Mode Network.

Without controlling for SNR 2, there is a marginally significant positive association between PR‐Smiling and Laughing scores and left DMN functional connectivity ( F (5, 29) = 2.45, p = 0.057) ( R 2 = 0.30, Adjusted R 2 = 0.18), but not right DMN functional connectivity ( F (5, 29) = 0.31, p = 0.902) ( R 2 = 0.23, Adjusted R 2 = −0.11). 3.5 Exploratory Bayesian Analysis To test the extent of the association between PR‐Smiling and Laughing scores and left DMN functional connectivity, we employed a Bayesian regression analysis in JASP (Version 0.18.3; Coon et al. 2025 ; Kelter 2020 ).

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