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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they don’t stimulate neurons near the scalp where the electrodes sit, but do stimulate them at an intersection point deeper inside the brain.
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Alternatively, ultrasound waves in a magnetic field can create an electric current; so if you focus ultrasound at a point inside the brain, and have an ambient magnetic field around, you can get focused deep brain stimulation.
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