[The investigation of different types of vocal disorder by statistical frequency analysis (author's transl)]

Common disorders of the vocal cords were assessed by indirect and direct laryngoscopy and by stroboscopy, and they were compared over the frequency range of "a". Amplitude and frequency variations from the normal are illustrated in recurrent laryngeal nerve paralysis, intubation granuloma, chronic oedema, the hyperkeratosis of chronic laryngitis, hypokinesia and hypokinetic dysphonia. In several cases, the effects of exercise or previous surgery are demonstrated. The described technique gives a useful aid to the management of vocal cord disease.