Hasbroucq T, Possamaï C A, Bonnet M, Vidal F
Centre de Recherche en Neurosciences Cognitives, Centre National de la Recherche Scientifique, Marseille, France.
Psychophysiology. 1999 Jul;36(4):522-6. doi: 10.1017/s0048577299001602.
Choice reaction time (RT) is shorter when the stimulus corresponds spatially to the response than when the stimulus does not, even when the stimulus location is irrelevant to the task. We used electromyographic measures to document that this effect is the result of a response conflict. The activity of the prime movers of two alternative responses was recorded during the performance of a visual RT task in which the irrelevant spatial correspondence between the stimuli and the responses was varied. Only the premotor component of RT was affected by the stimulus-response correspondence. Correct trials were distinguished according to whether or not the activation of the prime mover involved in the required response was preceded by an activation of the prime mover involved in the alternative response. Double muscular activation trials were more numerous for noncorresponding than for corresponding stimulus-response associations. Furthermore, these trials yielded longer RTs than the single muscular activation trials.
当刺激在空间上与反应相对应时，选择反应时（RT）比刺激与反应不对应时更短，即使刺激位置与任务无关。我们使用肌电图测量来证明这种效应是反应冲突的结果。在一项视觉RT任务中，记录了两种替代反应的原动肌活动，其中刺激与反应之间不相关的空间对应关系是变化的。只有RT的运动前成分受到刺激-反应对应的影响。根据所需反应中涉及的原动肌激活是否先于替代反应中涉及的原动肌激活，对正确试验进行区分。对于非对应刺激-反应关联，双肌肉激活试验比对应关联更多。此外，这些试验产生的RT比单肌肉激活试验更长。
