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Diplophonia
From Wikipedia, the free encyclopedia
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Diplophonia, also known as diphthongia, is a phenomenon in which a voice is perceived as being produced with two concurrent pitches.[1] Diplophonia is a result of vocal fold vibrations that are quasi-periodic in nature.[2] It has been reported from old days, but there is no uniform interpretation of established mechanisms.[3] It has been established that diplophonia can be caused by various vocal fold pathologies, such as vocal folds polyp, vocal fold nodule, recurrent laryngeal nerve paralysis[3] or vestibular fold hypertrophy.[4]
The Voice Quality Symbol for diplophonia is V̬‼.
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