Accessory stimulus modulates execute function during stepping task.
Accessory stimulus modulates execute function during stepping task.
复制标题
辅助刺激在步进任务期间调节执行功能。
DOI：
10.1152/jn.00222.2015
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发表时间：
2015
影响因子：
2.5
通讯作者：
Nojima I.
中科院分区：
文献类型：
--
作者：
Watanabe T;Koyama S;Tnanabe S;Nojima I.
当多种感觉模式同时出现时，反应时间会减少，而干扰会增加。本研究的目的是检查与任务无关的听觉辅助刺激与视觉命令性刺激同时呈现对步进过程中执行功能的影响。通过分析步骤之前姿势反应的初始重量转移中的时间事件和误差（预期姿势调整误差）来评估执行功能。十一名健康的年轻人对视觉刺激做出反应，走上前去。我们应用了选择反应时间任务和西蒙任务，其中包括一致和不一致条件。辅助刺激与视觉刺激随机呈现。与没有辅助刺激的试验相比，在不一致条件下有辅助刺激的试验中预期姿势调整错误率较高，并且在所有任务条件下有辅助刺激的试验中反应时间较短。根据是否发生预期姿势调整错误对试验进行划分后的分析表明，在不一致的情况下，有预期姿势调整错误的试验的反应时间比没有预期姿势调整错误的试验减少更多。这些结果表明，辅助刺激通过降低决策阈值来调节步进的初始运动编程，并且专门在空间不兼容的情况下促进自动响应激活。目前的研究结果增进了对迈步过程中感觉间判断过程的了解，并可能有助于为有跌倒风险的个人开发干预和评估工具。
When multiple sensory modalities are simultaneously presented, reaction time can be reduced while interference enlarges. The purpose of this research was to examine the effects of task-irrelevant acoustic accessory stimuli simultaneously presented with visual imperative stimuli on executive function during stepping. Executive functions were assessed by analyzing temporal events and errors in the initial weight transfer of the postural responses prior to a step (anticipatory postural adjustment errors). Eleven healthy young adults stepped forward in response to a visual stimulus. We applied a choice reaction time task and the Simon task, which consisted of congruent and incongruent conditions. Accessory stimuli were randomly presented with the visual stimuli. Compared with trials without accessory stimuli, the anticipatory postural adjustment error rates were higher in trials with accessory stimuli in the incongruent condition and the reaction times were shorter in trials with accessory stimuli in all the task conditions. Analyses after division of trials according to whether anticipatory postural adjustment error occurred or not revealed that the reaction times of trials with anticipatory postural adjustment errors were reduced more than those of trials without anticipatory postural adjustment errors in the incongruent condition. These results suggest that accessory stimuli modulate the initial motor programming of stepping by lowering decision threshold and exclusively under spatial incompatibility facilitate automatic response activation. The present findings advance the knowledge of intersensory judgment processes during stepping and may aid in the development of intervention and evaluation tools for individuals at risk of falls.