This study, involving an adolescent and adult male with stuttering problems, evaluated modification of the frequency of electroglottograph-measured phonation intervals on stuttering and speech naturalness. Both subjects demonstrated that stuttering could be controlled by modifying the frequency of phonation intervals within short duration ranges,…

Of 169 adult and adolescent stutterers studied, 112 reported family history of stuttering. Only 3 of the 112 reported birth or early childhood factors that might precipitate stuttering, as opposed to 21 of those without family history of stuttering. By considering these two conditions as separate factors in behavior, stutterers may be divided into…

This study investigated whether syntactic complexity exerts an influence on the frequency of stuttering in the speech of seven adolescents who stuttered and seven who were normally fluent. Although normal disfluencies and errors in repetition accuracy increased as syntactic complexity increased, stuttering frequency did not appear to be affected…