Why may speech-correction instruction be needed after a person suddenly loses hearing?

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When a person suddenly loses their hearing, speech-correction instruction may be necessary because the individual loses the auditory feedback mechanism that normally allows a speaker to monitor their own voice.12

Under normal conditions, this feedback loop informs the speaker about the pitch, volume, inflection, and articulatory accuracy of their speech. Without the ability to hear one's own voice, speech patterns often begin to deteriorate, frequently acquiring the flat, toneless quality characteristic of the profoundly deaf. Consequently, speech-correction instruction is used to help the individual maintain speech quality and adapt to the loss of these auditory cues.12