The collected speech samples consisted of spontaneous speech (monologue) and reading of a text, in two different listening conditions, namely: non-altered auditory feedback (NAF) and delayed auditory feedback (DAF).
Adult's speech was recorded and processed using a software that performed Delayed Auditory Feedback (DAF) and it was returned to the adult's ear with a delay of 100 milliseconds through the earphone.
There was an increase in the common disfluencies occurrence and speech discontinuity in spontaneous speech with delayed auditory feedback, and a decrease in the flow of syllables and words per minute (Table 2).
There was an increase in the occurrence of stuttering-like disfluencies and speech discontinuity, as well as a decrease in the amount of common disfluencies in the delayed auditory feedback condition.
Thus, this study analyzed the effect of delayed auditory feedback in adults with stuttering in the frequency of disfluencies and speech rate in spontaneous speech and reading of text, and compared it with fluent adults, through a specific software.
Researches (37) also suggest that the act of monitoring another speech, as with the chorus effect that delayed auditory feedback causes, assists the stuttering speaker to generate temporal patterns and articulatory gestures that are necessary in fluent speech.
5% with delayed auditory feedback, lower than those reported in other studies that were performed using SpeechEasy 45% (29) and 40% (30).
The results regarding the effects of delayed auditory feedback on spontaneous speech and reading of fluent adults showed that there was a significant effect for all measures assessed on the frequency of disfluencies and the speech rate, except for stuttering-like disfluencies in spontaneous speech.