About: The Edinburgh Masker synthesized a sine wave synchronized to the user’s fundamental frequency of phonation, i.e., a humming sound matching your vocal pitch.
Evidence: Two clinical trials found that the device reduced stuttering about 50%, and that the effectiveness didn’t diminish over a period of six months.
- Block, S., Ingham, R.J., & Bench, R.J. (1996). The effects of the Edinburgh Masker on stuttering. Australian Journal of Human Communication Disorders, 24, 11-18.
- Dewar, A., Dewar, A.D., Austin, W.T.S., Brash, H.M. (1979) The Long Term Use of an Automatically Triggered Auditory Feedback Masking Device in the Treatment of Stammering. British Journal of Disorders of Communication, 14(3), 19-26.