Selected visible and audible features of stuttered speech were studied to determine whether these phenomena suggested a basis for differentiating among stutterers. Forty-six visible and audible phenomena of stuttering were examined in 23 stutterers, using a frame-by-frame analysis of sound motion picture film. Significant inter-subject differences…

Preliminary to a survey of a national sample of 40,000 subjects intended to estimate prevalence of speech and hearing disorders in the United States public school population, a mobile unit collected data on a pilot sample of subjects in grades 1 through 12. Speech testing of 6,290 subjects indicated about 85% had articulation which did not deviate…