Think Out LoudOHSU researchers connect tinnitus with elevated serotonin activity in the brainBy Gemma DiCarlo (OPB)May 12, 2026 1 p.m.Broadcast: Tuesday, May 12📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up