“…In general, activity of the laryngeal muscles increases as F 0 during vocalization increases; this is particularly true of the cricothyroid and vocalis muscles, whose activity increases dramatically at higher frequencies (Chhetri, Neubauer, & Berry, 2012;Kochis-Jennings, Finnegan, Hoffman, & Jaiswal, 2012;Titze, 1994), although the extrinsic laryngeal muscle, sternohyoid, also displays a contribution to higher frequencies as the larynx is raised (Hirano & Ohala, 1969). Higher F 0 production is also associated with increases in tracheal pressure (Verdolini-Marston, Titze, & Druker, 1990), as well as increases in loudness and glottal airflow (Isshiki, 1965).…”