Moll has a passage on this subject, Untersuchungen über die Libido Sexualis. Bd. I, pp. 376-381.
HEARING.
I.
The Physiological Basis of Rhythm—Rhythm as a Physiological Stimulus—The Intimate Relation of Rhythm to Movement—The Physiological Influence of Music on Muscular Action, Circulation, Respiration, etc.—The Place of Music in Sexual Selection among the Lower Animals—Its Comparatively Small Place in Courtship among Mammals—The Larynx and Voice in Man—The Significance of the Pubertal Changes—Ancient Beliefs Concerning the Influence of Music in Morals, Education, and Medicine—Its Therapeutic Uses—Significance of the Romantic Interest in Music at Puberty—Men Comparatively Insusceptible to the Specifically Sexual Influence of Music—Rarity of Sexual Perversions on the Basis of the Sense of Hearing—The Part of Music in Primitive Human Courtship—Women Notably Susceptible to the Specifically Sexual Influence of Music and the Voice.
The sense of rhythm—on which it may be said that the sensory exciting effects of hearing, including music, finally rest—may probably be regarded as a fundamental quality of neuro-muscular tissue. Not only are the chief physiological functions of the body, like the circulation and the respiration, definitely rhythmical, but our senses insist on imparting a rhythmic grouping even to an absolutely uniform succession of sensations. It seems probable, although this view is still liable to be disputed, that this rhythm is the result of kinæsthetic sensations,—sensations arising from movement or tension started reflexly in the muscles by the external stimuli,—impressing themselves on the sensations that are thus grouped.[[86]] We may thus say, with Wilks, that music appears to have had its origin in muscular action.[[87]]