A non-invasive brain stimulation technique that applies low-intensity direct current via scalp electrodes to modulate cortical excitability, enhance neuroplasticity, and support neurological recovery.
Transcranial direct current stimulation (tDCS) delivers a weak direct current (typically 1-2 milliamps) through electrodes placed on the scalp. This current modulates the resting membrane potential of cortical neurons, making them more or less likely to fire depending on electrode polarity.
Anodal stimulation (positive electrode) generally increases cortical excitability, while cathodal stimulation decreases it. This allows clinicians to selectively enhance or suppress activity in targeted brain regions based on the patient’s neurological profile.
The weak current flows between the anode and cathode electrodes through the scalp and skull into the underlying cortex. At the neuronal level, anodal tDCS depolarizes the resting membrane potential, bringing neurons closer to their firing threshold and increasing spontaneous neural activity. These effects persist beyond the stimulation period through mechanisms related to long-term potentiation (LTP).
When combined with cognitive tasks, rehabilitation exercises, or other therapies during the stimulation period, tDCS can enhance learning and skill acquisition by promoting synaptic plasticity in the targeted brain regions.
tDCS electrode placement and stimulation parameters are customized based on your specific diagnosis. Our neuromodulation specialists will design the appropriate protocol.
Saline-soaked sponge electrodes are placed on specific scalp locations. The patient sits or reclines comfortably during the 20-30 minute session. Most patients feel only a mild tingling or itching sensation under the electrodes at the start of stimulation. The treatment is painless. Many patients engage in cognitive exercises or rehabilitation tasks during the session to enhance the effect. A typical course involves 10-20 sessions over 2-4 weeks.
tDCS is one of the most extensively studied non-invasive brain stimulation techniques, with thousands of published studies. Meta-analyses in journals including Brain Stimulation, JAMA Psychiatry, and Neurology support its efficacy for depression and chronic pain. The treatment has an excellent safety profile — no serious adverse events have been reported in over 33,000 sessions documented in the literature. Contraindications include metallic implants near the electrode sites and skull defects.
Contact our neuromodulation team to discuss whether transcranial direct current stimulation may benefit your condition.
