期刊
BIOLOGICAL PSYCHOLOGY
卷 78, 期 3, 页码 246-252出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.biopsycho.2008.03.008
关键词
Simon effect; stimulus-response compatibility; event-related potentials; EEG; P300
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. (C) 2008 Elsevier B.V. All rights reserved.
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