Left dorsolateral prefrontal cortex to subgenual anterior cingulate cortex circuit (L-DLPFC/sgACC circuit)

The Left Dorsolateral Prefrontal Cortex to Subgenual Anterior Cingulate Cortex (L-DLPFC/sgACC) circuit is a critical neural network involved in the top-down regulation of emotion and cognitive control (Fox et al., 2012, Biological Psychiatry). In clinical psychiatry, this circuit is recognized for its central role in Major Depressive Disorder (MDD), where a characteristic imbalance exists: the L-DLPFC is typically underactive, failing to provide sufficient inhibitory control over the hyperactive sgACC, also known as Brodmann Area 25 (Mayberg et al., 2005, Neuron). This circuit serves as a primary target for advanced neuromodulation therapies like Repetitive Transcranial Magnetic Stimulation (rTMS) and Deep Brain Stimulation (DBS). By applying high-frequency stimulation to the L-DLPFC, clinicians aim to strengthen its functional connectivity and suppress pathological activity in the sgACC, leading to significant antidepressant effects (Cole et al., 2020, American Journal of Psychiatry). Beyond physical stimulation, the circuit's activity is modulated by rapid-acting antidepressants like ketamine and traditional serotonergic drugs, which help restore synaptic plasticity and network stability. Accurate targeting of this circuit, often guided by individual functional MRI (fMRI) mapping, is a cornerstone of personalized psychiatric treatment and the basis for the Stanford Neuromodulation Therapy (SNT) protocol (Williams et al., 2021, American Journal of Psychiatry).

Other names

DLPFC-sgACC pathwaySubgenual cingulate circuitFrontocingulate circuitBrodmann Area 46-Area 25 circuitDorsolateral prefrontal-subgenual cingulate functional connectivity

The circuit is primarily targeted via neuromodulation, such as Repetitive Transcranial Magnetic Stimulation (rTMS), which applies high-frequency excitatory pulses to the L-DLPFC to induce downstream inhibitory effects on the hyperactive sgACC through their functional anti-correlation (Fox et al., 2012, Biological Psychiatry). Pharmacological agents like ketamine modulate this circuit by enhancing synaptic plasticity and rapidly altering the functional connectivity between these regions to restore emotional homeostasis (Liston et al., 2019, Science).