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Clinical significance of the two-mass-model

The two mass model (2MM) as introduced by Ishizaka & Flanagan (1972) and simplified by Steinecke & Herzel (1995) describes many features of the vocal fold oscillation patterns [1,2]. Particularly, it was shown that a large variety of voice disorders may be explained by means of high-speed observations with subsequent interpretation by the 2MM. Laryngeal symmetry was identified as an important precondition for regular phonation [3]. Slight laryngeal asymmetries in vibrating masses or vocal fold tension may be compensated by the coupling of left and right vocal fold during collisions. However, when larger asymmetries are present, the voice may be hoarse. The purpose of this study was to identify critical values of asymmetry concerning mass and tension based on the 2MM.