Garber S R, Moller K T
J Speech Hear Res. 1979 Jun;22(2):321-33. doi: 10.1044/jshr.2202.321.
Two groups of subjects, one with normal speech and one with hypernasal speech, spoke while hearing their voices unfiltered, low-pass filtered with cut-off frequencies of 1000, 500, and 300 Hz and high-pass filtered with cut-off frequencies of 500, 1000, and 2000 Hz. Measurements of nasalization were made with a miniature accelerometer attached to the side of the subject's nose. Both groups of subjects decreased nasalization when hearing their voices low-pass filtered with a cut-off frequency of 300 Hz. This decrease was statistically significant. The results were interpreted as supporting the hypothesis that nasalization is under feedback control.
两组受试者，一组具有正常语音，另一组具有鼻音过重的语音，在听到自己未经过滤的声音、截止频率为1000Hz、500Hz和300Hz的低通滤波声音以及截止频率为500Hz、1000Hz和2000Hz的高通滤波声音时进行发声。使用附着在受试者鼻子一侧的微型加速度计进行鼻音化测量。两组受试者在听到截止频率为300Hz的低通滤波声音时，鼻音化程度均降低。这种降低具有统计学意义。结果被解释为支持鼻音化受反馈控制这一假设。
