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 eve n 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 havi ng a sufficient delay that automatically causes the individual to slow his or h er speech rate.
NON-STUTTERING BIOFEEDBACK METHOD AND APPARATUS USING DAF