Towards personalized cognitive brain stimulation for depression

Depression warps how people process good and bad news, and a new wave of brain stimulation treatments aims to correct that cognitive bias directly. Current non-invasive brain stimulation for depression—such as transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS)—targets broad brain regions like the dorsolateral prefrontal cortex, but response varies widely between patients. The researcher proposes a more precise approach: instead of using resting-state brain scans to pick a stimulation site, they will target two specific areas based on their cognitive roles. The dorsomedial prefrontal cortex (DMPFC) will be stimulated to boost learning from positive outcomes, while the lateral orbitofrontal cortex (LOFC) will be stimulated to reduce inappropriate self-blame for negative outcomes. This is grounded in the theory that effective depression treatments work by rapidly reducing negative cognitive biases, and that mood improvement over time depends on reinforcement learning. If this proof-of-concept succeeds, it could transform brain stimulation from a one-size-fits-all procedure into a personalised therapy that targets the specific cognitive distortions driving a patient’s depression. The immediate impact would be on clinical practice—offering a more rational, mechanism-based way to select stimulation targets—rather than on everyday infrastructure. This is fundamental science: establishing whether cognitive targeting can improve treatment outcomes, with the long-term goal of making depression therapy faster and more reliable.