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The Effects of White Noise on the Frequency of Stuttering

Three adult male stutterers spoke spontaneously during a series of base-rate and noise sessions. Base rate was run first for a minimum of 100 minutes and until two criteria of stability were met. Following base rate, all subjects were presented binaurally with a 100 dB SPL white noise for a minimum of 100 minutes. One subject also was tested under 80 dB SPL noise and 60 dB SPL noise. All subjects decreased their stuttering frequencies during the first five-minute period in which the 100-dB noise was presented. Over longer periods of time under 100 dB, one subject increased his frequency of stuttering slightly, and one subject decreased his frequency of stuttering slightly. The third subject's frequency of stuttering decreased significantly under 100 and 80 dB, but not under 60 dB. It appears that the effects of short- and long-term noise on stuttering are not the same.