Galashan Daniela, Wittfoth Matthias, Fehr Thorsten, Herrmann Manfred
Department of Neuropsychology/Behavioral Neurobiology, Center for Cognitive Sciences (ZKW), University of Bremen-Cognium Building, Bremen, Germany.
Biol Psychol. 2008 Jul;78(3):246-52. doi: 10.1016/j.biopsycho.2008.03.008. Epub 2008 Mar 20.
Behavioral and electrophysiological correlates of two Simon tasks were examined using comparable stimuli but different task-irrelevant and conflict-inducing stimulus features. Whereas target shape was always the task-relevant stimulus attribute, either target location (location-based task) or motion direction within the target stimuli (motion-based task) was used as a source of conflict. Data from ten healthy participants who performed both tasks are presented. In the motion-based task the incompatible condition showed smaller P300 amplitudes at Pz than the compatible condition and the location-based task yielded a trend towards a reduced P300 amplitude in the incompatible condition. For both tasks, no P300 latency differences between the conditions were found at Pz. The results suggest that the motion-based task elicits behavioral and electrophysiological effects comparable with regular Simon tasks. As all stimuli in the motion-based Simon task were presented centrally the present data strongly argue against the attention-shifting account as an explanatory approach.
使用可比的刺激，但不同的任务无关和冲突诱导刺激特征，研究了两个西蒙任务的行为和电生理相关性。目标形状始终是任务相关的刺激属性，而目标位置（基于位置的任务）或目标刺激内的运动方向（基于运动的任务）被用作冲突源。展示了来自十名执行这两项任务的健康参与者的数据。在基于运动的任务中，不相容条件下Pz处的P300波幅比相容条件下小，而基于位置的任务在不相容条件下有P300波幅降低的趋势。对于这两项任务，在Pz处未发现不同条件之间的P300潜伏期差异。结果表明，基于运动的任务引发的行为和电生理效应与常规西蒙任务相当。由于基于运动的西蒙任务中的所有刺激都在中央呈现，目前的数据强烈反对将注意力转移作为一种解释方法。
