Diplophonia, also known as diphthongia, is a phenomenon in which a voice is perceived as being produced with two concurrent pitches. Diplophonia is a result of vocal fold vibrations that are quasi-periodic in nature. It has been reported from old days, but there are no uniform interpretation of established mechanisms. 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 or vestibular fold hypertrophy.
- Ward; Sanders; Goldman; Moore (1969). "Diplophonia". The Annals of Otology, Rhinology, and Laryngology. 78.
- Kiritani; Hirose; Imagawa (1993). "High-speed digital image analysis of vocal cord vibration in diplophonia". Speech Communication. 13.
- 吉岡博英 (1987). "二重声の成立機序に関する音響的側面について" (in Japanese). 筑波大学. Retrieved 2015-12-26.
- "仮声帯肥大" (in Japanese). sickness-dictionary.jp. Retrieved 2015-12-26.
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