ABSTRACT
Voice disorders must, according to our definition, be regarded as deviations from that type of voice which is commonly agreed upon. Expenditure of air must be checked together with the intensity of the voice. The ear can–according to Weber’s rule–hear a deviation in the intensity of voice only if this is either increased or decreased by at least one-third. Diseased voices generally show a much greater divergence, and will take considerable time to return to the original tone, whereas healthy voices get back quickly and, after some time, learn to show hardly any deviation at all. Some methods of adjustment in the treatment of functional disturbances are also of diagnostic value, since they show whether and to what extent it is possible to adjust voice. Adjustment may be achieved by faradic current or by means of an intermittent current of air, pneumatically transferred to the larynx.
