SummaryTwo previously unassociated techniques have been combined to provide an objective analysis of the function of the whole vocal tract. Xeroradiography and electrolaryngography provide quantifiable visual information on soft tissue changes associated with voice disorders.Aberrent modes of vibration in the vocal fold area are displayed by the electrolaryngograph. The associated aberrant muscle patterns in the supraglottic regions are seen in the xeroradiographs as quantitative changes in anatomical parameters. Specific information on the muscles involved in excess tension is now available, even where no abnormality is detected by indirect laryngoscopy.