A study led by researchers at Children’s Hospital Los Angeles demonstrates what lead investigator Bradley Peterson, MD, calls “a critical mass of evidence” of a common underlying lifelong vulnerability in both children and adults who stutter. They discovered that regional cerebral blood flow is reduced in the Broca’s area — the region in the frontal lobe of the brain linked to speech production — in persons who stutter. More severe stuttering is associated with even greater reductions in blood flow to this region.