Brain implant may lift most severe depression

An electrical implant that sits in the skull and is wired to the brain can detect and treat severe depression, US scientists believe after promising results with a first patient. Sarah, who is 36, had the device fitted more than a year ago and says it has turned her life around. The matchbox-sized pack in her head is always "on" but only delivers an impulse when it senses she may need it.
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