[Mutation voice disorders conditioned by psychic factors]. / Zaburzenia glosu mutacyjnego uwarunkowane czynnikami psychicznymi.

The case of 17 year old boy with mutational falsetto conditioned by a complex of psychic factors particulary with personality disorders and strong emotional bond with his mother was described. Phonation exercises lowered the average voice pitch. The stable results of phoniatric rehabilitation is dependent on effectiveness of psychological therapy of the whole family. Acoustic voice analysis demonstrates objectively the results of rehabilitation.