Forster D C, Webster W G
Carleton University.
Can J Psychol. 1991 Sep;45(3):321-35. doi: 10.1037/h0084300.
Using all four combinations of hand and foot, adult stutterers and nonstutterers performed a unimanual sequential finger tapping task together with a stimulus-contingent foot responding task. The two groups were similar in that both demonstrated more dual-task interference when using the ipsilateral than contralateral limb pairs. Contrary to a prediction based on a hypothesis that attributes stuttering to neural interference due to an ungated or unregulated activity flow between the hemispheres, stutterers did not show more interference than nonstutterers when using the contralateral limb pairs. The groups did differ, however, in terms of finger tapping interference associated with right- versus left-foot concurrent task responding. Nonstutterers showed more interference when using the left than right foot. This was interpreted in terms of the attentional demands that the foot responding task placed on a system with an inherent left-hemisphere attentional bias. The lack of a reliable difference in stutterers with respect to interference by the two feet is consistent with indications from other research that stutterers have a relatively labile system of hemispheric attention or activation. The results of the study are placed into the context of a general model of the brain mechanisms associated with stuttering.
成年口吃者和非口吃者使用手和脚的所有四种组合，完成了一项单手连续手指敲击任务以及一项与刺激相关的脚部反应任务。两组的相似之处在于，当使用同侧肢体对而非对侧肢体对时，两者都表现出更多的双任务干扰。基于将口吃归因于半球之间无节制或不受调节的活动流导致的神经干扰这一假设的预测相反，口吃者在使用对侧肢体对时并未表现出比非口吃者更多的干扰。然而，两组在与右脚和左脚同时进行任务反应相关的手指敲击干扰方面存在差异。非口吃者在使用左脚时比右脚表现出更多的干扰。这是根据脚部反应任务对具有固有左半球注意力偏向的系统所提出的注意力需求来解释的。口吃者在两脚干扰方面缺乏可靠差异，这与其他研究表明口吃者具有相对不稳定的半球注意力或激活系统的迹象一致。该研究结果被置于与口吃相关的大脑机制的一般模型背景中。
