Double voice

The double voice means a phenomenon to hear as having had two voices and coming at the same time. There is a report than old times, but the unified interpretation about the establishment mechanism is not established [¹]. I am known to appear as a vocal cord polyp, a vocal cords nodule, the recurrent laryngeal nerve paralysis [¹] or a symptom of the false vocal cords enlargement [²].

Source

1. ^ ^{a b} Hirohide Yoshioka (1987). "About the acoustic side about the establishment mechanism of the double voice". Tsukuba University. December 26, 2015 reading.
2. ^ "false vocal cords enlargement." sickness-dictionary.jp. December 26, 2015 reading.

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