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The relationship between GM density (arbitrary units) in the left and right OFC and measures of SNS. From top to bottom: Facebook friends (n = 36), Dunbar’s number (n = 38) and Norbeck’s Social Support Network (n = 40). GM density was computed by regressing out age and TIV, and normalized to z-scores across participants. Areas within the OFC ROI that correlated with SNS are displayed on an inflated brain at P < 0.05 (uncorrected) for illustrative purposes.
