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Infants with high prenatal stress do not show parasympathetic recovery during still-face reunion; high-stress girls show lower respiratory sinus arrhythmia than low-stress girls, whereas high-stress boys show higher respiratory sinus arrhythmia than low-stress boys. Note: lnRSA = respiratory sinus arrhythmia; PP1 = play period 1; PP2 = play period 2; SEM = standard error of the mean; SF = still face.
