Ge. Lancioni et al., REDUCING EXCESSIVE VOCAL LOUDNESS IN PERSONS WITH MENTAL-RETARDATION THROUGH THE USE OF A PORTABLE AUDITORY-FEEDBACK DEVICE, Journal of behavior therapy and experimental psychiatry, 28(2), 1997, pp. 123-128
A simple portable device was used to reduce excessive vocal loudness i
n two adults affected by moderate mental retardation. The device provi
ded these adults with auditory feedback (a pulsating tone of about 300
Hz and 80 dB) when their vocal loudness exceeded a preset limit. Data
showed that the device was effective in helping the two adults reduce
their excessive vocal loudness. The use of the device continued to pr
oduce positive effects over time. Implications of these findings are d
iscussed. (C) 1997 Elsevier Science Ltd.