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Deep brain stimulation is becoming very precise. This technique allows surgeons to place electrodes in almost any area of the brain, and turn them up or down - like a radio dial or thermostat - to correct dysfunction. Andres Lozano offers a dramatic look at emerging techniques, in which a woman with Parkinson’s instantly stops shaking and brain areas eroded by Alzheimer’s are brought back to life. See more: http://www.ted.com/talks/andres_lozano_parkinson_s_depression_and_the_switch_that_mig...