Watson B C, Alfonso P J
University of Connecticut, Storrs.
J Speech Hear Res. 1987 Dec;30(4):434-47. doi: 10.1044/jshr.3004.434.
The simple reaction time paradigm, incorporating a variable foreperiod, was used to investigate relative contributions of the respiratory and laryngeal systems to mild and severe stutterers' prolonged acoustic laryngeal reaction time (LRT) values. Prephonatory kinematic data were analyzed in terms of frequency of initiation, timing, and organization of events executed to attain the functional physiological targets of respiratory inflation during foreperiods and phonation onset after foreperiods. Acoustic data replicated a previously observed composite stuttering severity and foreperiod effect on stutterers' acoustic LRT values. Kinematic data revealed that, in general, the mild stutterers demonstrated delayed initiation of respiratory events and appropriate organization of respiratory and laryngeal events while the severe stutterers demonstrated delayed initiation of laryngeal events and inappropriate organization of respiratory and laryngeal events. That is, kinematic data both account for group differences in acoustic LRT values as a function of foreperiod and support the notion that differential respiratory and laryngeal deficits underly mild and severe stutterers' prolonged acoustic LRT values.
采用包含可变准备期的简单反应时范式，来研究呼吸和喉部系统对轻度和重度口吃者延长的声学喉部反应时（LRT）值的相对贡献。对发声前运动学数据进行了分析，分析内容包括准备期内为实现呼吸充气功能生理目标而执行的动作的启动频率、时间和组织，以及准备期后发声开始时的情况。声学数据重复了先前观察到的口吃严重程度和准备期对口吃者声学LRT值的综合影响。运动学数据显示，总体而言，轻度口吃者表现出呼吸事件启动延迟以及呼吸和喉部事件的适当组织，而重度口吃者则表现出喉部事件启动延迟以及呼吸和喉部事件的不适当组织。也就是说，运动学数据既解释了声学LRT值随准备期变化的组间差异，也支持了这样一种观点，即不同的呼吸和喉部缺陷是轻度和重度口吃者延长的声学LRT值的基础。
