Methods, devices and systems treat non-stuttering speech and/or language
related disorders by administering a delayed auditory feedback signal
having a delay of under about 200 ms via a portable device. The DAF
treatment may be delivered on a chronic basis. For certain disorders,
such as Parkinson's disease, the delay is set to be under about 100 ms,
and may be set to be even shorter such as about 50 ms or less. Certain
methods treat cluttering (an abnormally fast speech rate) by exposing the
individual to a DAF signal having a sufficient delay that automatically
causes the individual to slow his or her speech rate.
