THE style of phonation, or the mode of phonation, is one of the very important factors which characterizes the human voice. Clinicians have been greatly interested in the style of phonation because of its clinical importance. Protracted phonation with an improper style can cause laryngeal diseases or voice disorders, such as contact ulcer, vocal cord nodule, vocal cord polyp, phonasthenia ("myasthenia laryngis" by Jackson1), and so on (Brodnitz2,3; Froeschels4; Green5; Holinger and Johnston6; Jackson7; Jackson and Jackson8; Luchsinger and Arnold9; Murphy10; Peacher and Holinger11; von Leden and Moore12). On the other hand, patients with various kinds of laryngeal diseases often can develop unfavorable styles of phonation. A vicious circle may thus develop between an improper style of phonation, and a laryngeal disease or voice disorder. The importance of correction of bad vocal habits has been emphasized by many laryngologiste
Hirano M, Koike Y, Joyner J. Style of PhonationAn Electromyographic Investigation of Some Laryngeal Muscles. Arch Otolaryngol. 1969;89(6):902–907. doi:10.1001/archotol.1969.00770020904020
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