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The Role of the DLPFC

DLPFC: a key target area in rTMS for depression. Its role in mood regulation and executive functions.

The dorsolateral prefrontal cortex (DLPFC) is the main stimulation target in rTMS for depression. It is located in the lateral prefrontal cortex, corresponding mainly to Brodmann areas 9 and 46, and functions as a control hub for executive function, emotional regulation, and working memory processing. These changes are achieved through DLPFC neuroplasticity.

Why it matters

In major depressive disorder, the left DLPFC shows systematically reduced metabolic activity and reduced functional connectivity with the anterior cingulate cortex (ACC). Correcting this dysfunction through rTMS is a central mechanism of antidepressant action.

Mechanism

  • Left DLPFC: underactive in MDD → target of activating protocols, such as HF-rTMS and iTBS.
  • Right DLPFC: relatively overactive → target of inhibitory protocols, such as LF-rTMS and cTBS, and may also be relevant for anxiety and OCD protocols.
  • The DLPFC exerts top-down control over the ACC through prefrontal-limbic pathways. When this connection is restored, processing of negative emotion may normalize.
  • Neural basis: glutamatergic layer V pyramidal neurons and GABAergic circuits within the DLPFC.
  • Stimulation of the left DLPFC indirectly increases dopaminergic and serotonergic neurotransmission through corticostriatal circuits.

Clinical significance

Classic targeting used the “5 cm rule” — 5 cm anterior to the motor hotspot. Modern approaches use MRI-guided neuronavigation for more accurate localization. More precise targeting of the DLPFC based on functional connectivity, especially anticorrelation with the sgACC, is associated with improved clinical outcomes.

Explicit relations (Entity Graph)

  • DLPFC → primary target of → rTMS in MDD
  • Left DLPFC → hypoactive in → MDD
  • Left DLPFC → activated by → HF-rTMS / iTBS
  • Right DLPFC → inhibited by → LF-rTMS / cTBS
  • DLPFC → regulates → sgACC
  • DLPFC → part of → prefrontal-limbic circuit
  • DLPFC → dysfunction in → MDD / TRD / cognitive impairment
  • DLPFC → located in → Brodmann areas 9 and 46

References

  • Fox MD, Buckner RL, White MP, Greicius MD, Pascual-Leone A (2012). Efficacy of transcranial magnetic stimulation targets for depression is related to intrinsic functional connectivity with the subgenual cingulate. Biological Psychiatry.
  • Siddiqi SH, Taylor SF, Cooke D, Pascual-Leone A, George MS, Fox MD (2020). Distinct symptom-specific treatment targets for circuit-based neuromodulation. American Journal of Psychiatry.
  • Weigand A, Horn A, Caballero R, et al. (2018). Prospective validation that subgenual connectivity predicts antidepressant efficacy of transcranial magnetic stimulation sites. Biological Psychiatry.
  • O’Reardon JP, Solvason HB, Janicak PG, et al. (2007). Efficacy and safety of transcranial magnetic stimulation in the acute treatment of major depression: a multisite randomized controlled trial. Biological Psychiatry.