Vital Signs meets Dr. Laura Ann-Petitto who has spent four decades researching speech and language. Dr. Sanjay Gupta reports.
DETROIT - JUNE 1985: Lead guitarist Richie Sambora, lead vocalist and band namesake Jon Bon Jovi, and bassist Alec John Such, all with the rock band Bon Jovi, pose for a portrait on June 22, 1985, at Hart Plaza in Detroit, MI. (Photo by Ross Marino/Getty Images)