Replicable Connectivity and Spectral Alterations of Functional Networks in Major Depression

Major depressive disorder is linked to widespread, small but structured alterations across 105 intrinsic brain networks, with the thalamus showing the most altered connectivity and spectral power shifts.

• Why it matters: Functional MRI studies of MDD often rely on connectivity alone and may be underpowered to detect modest, multi-property network changes across sites.
• What they did: The authors used multi-scale, template-guided independent component analysis on resting-state fMRI from the multi-site MDD-DIRECT cohort, jointly assessing connectivity, spectral content, and spatial composition across 105 networks, then tested replication in an independent cohort.
• The result: Patient-control differences included reduced cerebello-subcortical coupling, increased subcortical–somatomotor coupling, and spectral power shifting from lower to higher frequencies, with replication agreement for 95% of significant connections, 78% of significant spectral effects, and 77% of the largest spatial-composition effects.

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