Is there any reason why it’s not physically possible to focus a current from an external headset to a location inside the brain? For a non-invasive equivalent of deep brain stimulation? Too much scattering?
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That's actual current. It goes by least resistance, so only useful for superficial stimulation (rather than deep). For deep you'd basically need a long metal probe to the point of stimulation. At that point direct current is probably easier.
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