• In this photo provided by Science Translational Medicine, PET scans taken at the Yale PET Center show the density of connections between nerve cells, called synapses, in a healthy living brain. Yale researchers developed a way to picture synapses in a living brain, something that until now has been studied mostly during autopsies. (Science Translational Medicine via AP)

    New technique opens window into how brain cells communicate

    WASHINGTON (AP) — The brain’s nerve cells communicate by firing messages to each other through junctions called synapses, and problems with those connections are linked to disorders like Alzheimer’s and epilepsy. Now Yale University researchers have developed a way to picture synapses in living brains.