transcranial direct current stimulation
Weak electrical currents are applied to the scalp
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Neurons in the cerebral cortex tend to be arranged with their information-gathering dendrites pointing outwards, towards the scalp, and their information-transmitting axons projecting inwards. When the positively charged tDCS electrode is close to the dendrites, the current causes active neurons to fire more frequently. The negative electrode does the opposite. So if you know the region of the cortex you want to target, you can zap it with one of the electrodes to either stimulate it or inhibit it. The overall effect of tDCS is to make the excited area work more effectively.
Richard Chi’s research on non-invasive brain stimulation.
New Scientist link. Next Big Future blog post.
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