Mattler Uwe
Fakultät für Naturwissenschaften, Institut für Psychologie II, Otto-von-Guericke Universität Magdeburg, Postfach 4120, 39016, Magdeburg, Germany.
Exp Brain Res. 2003 Jul;151(2):272-88. doi: 10.1007/s00221-003-1486-5. Epub 2003 May 9.
When participants were required to respond to a relevant central target and ignore irrelevant flanking stimuli, the flankers produced a response compatibility effect. Electrophysiological studies have shown that irrelevant flanker stimuli can affect the motor system. The present experiments further examined the characteristics of flanker effects on the motor system. Sixty participants responded in the flanker task to arrows (experiment 1) or letters (experiment 2). To examine time and extent of flanker effects on the motor system, target onset was delayed with blocked or random stimulus-onset asynchronies (SOA). With SOA of 0 and 100 ms, flanker effects on behavioral measures were reduced in random as compared to blocked conditions, but enhanced with SOA of 400 ms. With SOA of 400 ms, flanker effects on the early lateralized readiness potentials (LRP) were reduced in blocked as compared to random conditions, indicating that the onset of flanker effects on the LRP was delayed. Response-locked LRPs suggest that flanker and target stimuli activate the motor system successively. Findings challenge current theories of the flanker compatibility effect.
当要求参与者对相关的中央目标做出反应并忽略无关的侧翼刺激时，侧翼刺激会产生反应兼容性效应。电生理学研究表明，无关的侧翼刺激会影响运动系统。本实验进一步研究了侧翼效应在运动系统中的特征。60名参与者在侧翼任务中对箭头（实验1）或字母（实验2）做出反应。为了研究侧翼效应在运动系统中的时间和程度，通过阻塞或随机刺激起始异步（SOA）来延迟目标起始。在0和100毫秒的SOA条件下，与阻塞条件相比，随机条件下侧翼对行为测量的影响降低，但在400毫秒的SOA条件下增强。在400毫秒的SOA条件下，与随机条件相比，阻塞条件下侧翼对早期侧化准备电位（LRP）的影响降低，表明侧翼对LRP的影响起始延迟。反应锁定的LRP表明侧翼和目标刺激相继激活运动系统。这些发现挑战了当前关于侧翼兼容性效应的理论。
