Dromey Christopher, Benson April
Brigham Young University, Provo, UT 80602, USA.
J Speech Lang Hear Res. 2003 Oct;46(5):1234-46. doi: 10.1044/1092-4388(2003/096).
This study examined the influence of 3 different types of concurrent tasks on speech motor performance. The goal was to uncover potential differences in speech movements relating to the nature of the secondary task. Twenty young adults repeated sentences either with or without simultaneous distractor activities. These distractions included a motor task (putting together washers, nuts, and bolts), a linguistic task (generating verbs from nouns), and a cognitive task (performing mental arithmetic). Lip movement data collected during the experimental conditions revealed decreases in displacement and velocity during the motor task. The linguistic and cognitive tasks were associated with increased spatiotemporal variability and increases in the strength of the negative correlations between upper and lower lip displacements. These findings show that distractor tasks during speech can have a significant influence on several labial kinematic measures. This suggests that the balance of neural resources allocated to different aspects of human communication may shift according to situational demands.
本研究考察了3种不同类型的并发任务对言语运动表现的影响。目的是揭示与次要任务性质相关的言语运动潜在差异。20名年轻成年人在有或没有同时进行的干扰活动的情况下重复句子。这些干扰包括一项运动任务（组装垫圈、螺母和螺栓）、一项语言任务（从名词生成动词）和一项认知任务（进行心算）。在实验条件下收集的唇部运动数据显示，在运动任务期间位移和速度下降。语言和认知任务与时空变异性增加以及上下唇位移之间负相关强度增加有关。这些发现表明，言语过程中的干扰任务会对几种唇部运动学测量产生重大影响。这表明，分配给人类交流不同方面的神经资源平衡可能会根据情境需求而发生变化。
