Nobel medicine prize goes to 3 scientists for research into brain activity

STOCKHOLM (AP) — The Nobel Prize in medicine was awarded Monday to three scientists working on the mechanisms the brain uses to switch on, or off, the activity of individual nerve cells. Karl Deisseroth, 54, Peter Hegemann, 71, and Georg Nagel, 73, have carried out research into light-gated ion channels and optogenetics. The Nobel Assembly…