Group mean percent of correct as a function of signal-to-noise ratio (left panel) and the mean speech-in-noise threshold (right panel) in young nonmusicians, young wind/string players, young pianists, and young percussionists under (A) noise separation, (B) noise colocation, (C) speech separation, and (D) speech colocation. Error bars indicate standard error of the mean. Note that no group difference was observed for young adults.