Sur l’activité des muscles thoraco-abdominaux pendant la phonation

Tremulous Speech

“…In all likeli hood, the diaphragm, because it is generally relaxed in speech, is not affected by the inten tion tremor when the subject talks, and there fore is not responsible for voice trémulation. In fact, the muscles which have been found to control the expiratory air pressure during speech are the external and internal intercostals [Draper et al I960;Lebrun, 1966b] and most probably they cause the intensity and pitch fluctuations that are characteristic of voice trémulation.…”