Electromyographic activity of the orbicular muscle of the mouth stutterers and fluent speakers - Felício, Cláudia Maria de; Freitas, R. L. G.; Regalo, Simone Cecílio Hallak; Vitti, Mathias; Ferrioli, B. H. M. V. (Congress of The International Society of Electrophysiology and Kinesiology, 2006)