Perkins W, Rudas J, Johnson L, Bell J
J Speech Hear Res. 1976 Sep;19(3):509-22. doi: 10.1044/jshr.1903.509.
Complexity of phonatory and respiratory adjustments was systematically simplified in 30 adult stutterers under three speaking conditions: voiced, whispered, and articulated without phonation. Stuttering was reduced considerably when whispering and was practically eliminated when articulating silently. The possibility that stuttering consistently results from complexity of phonatory coordinations with articulation and respiration was strongly supported. Increased speaking rates under conditions that decreased stuttering seemed to be evidence that efficient rhythmical flow of speech is facilitated by simplification of phonatory and respiratory adjustments.
在三种说话条件下，对30名成年口吃者发声和呼吸调节的复杂性进行了系统简化：有声、低语以及无声发音。低语时口吃现象大幅减少，无声发音时口吃现象几乎消除。这有力地支持了口吃持续源于发声与发音及呼吸协调复杂性的可能性。在减少口吃的条件下，说话速度增加，这似乎表明发声和呼吸调节的简化有助于实现高效的节奏性言语流畅。
