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Current flow models of a 19.25 cm2 anodal electrode over medial-frontal cortex (site Fz in the 10/20 system) and a 52 cm2 cathodal electrode on the right cheek (left panel) or left cheek (right panel) at 2.0 mA. This figure shows how even the cheek sites are likely to produce fields in the lateral portions of the prefrontal and temporal lobes.
