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,…

Two profoundly hearing-impaired adolescents received systematic speech training to improve their production of two vowel sounds. Both subjects demonstrated significant changes in their production of the two vowels at the acoustic and perceptual levels following treatment, but changes were highly individualized. (DB)