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Discussing the issue of graphic depiction of the movement of the frontal muscles, the author describes the Sommer apparatus modified by him, with the help of which the movement processes on the forehead, their speed, as well as the relative participation in the movement of both frontal muscles - frontalis and corrugator, are graphically depicted.

nevrologičeskij vestnik

Klett Graphic depiction of movements of the frontal muscles. Die graphische Darstellung der Stirnmuskelbewegungen. Klinik. f. psych. u. nerv. Krankh. v. R. Sommer. B. V. H. 3. s. 232