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,…

This study investigated changes in the speech patterns of young adult male subjects when stuttering was modified by deliberately prolonging speech. Three subjects showed clinically significant stuttering reductions when using prolonged speech to reduce their stuttering. Resulting speech was perceptually stutter free. Acoustic and…

This study evaluated whether variations in the structure of minimal versus maximal opposition treatments would result in empirical differences in phonological learning with three four-year-old boys who excluded at least six sounds from their phonetic and phonemic inventories. Results indicated that treatment of maximal oppositions led to greater…