Pastötter Bernhard, Hanslmayr Simon, Bäuml Karl-Heinz
Department of Experimental Psychology, Regensburg University, Regensburg, Germany.
J Cogn Neurosci. 2008 Jan;20(1):65-75. doi: 10.1162/jocn.2008.20010.
Abstract In the orienting of attention paradigm, inhibition of return (IOR) refers to slowed responses to targets presented at the same location as a preceding stimulus. No consensus has yet been reached regarding the stages of information processing underlying the inhibition. We report the results of an electro-encephalogram experiment designed to examine the involvement of response inhibition in IOR. Using a cue-target design and a target-target design, we addressed the role of response inhibition in a location discrimination task. Event-related changes in beta power were measured because oscillatory beta activity has been shown to be related to motor activity. Bilaterally located sources in the primary motor cortex showed event-related beta desynchronization (ERD) both at cue and target presentation and a rebound to event-related beta synchronization (ERS) after movement execution. In both designs, IOR arose from an enhancement of beta synchrony. IOR was related to an increase of beta ERS in the target-target design and to a decrease of beta ERD in the cue-target design. These results suggest an important role of response inhibition in IOR.
摘要 在注意定向范式中，返回抑制（IOR）是指对出现在与先前刺激相同位置的目标的反应变慢。关于这种抑制背后的信息处理阶段尚未达成共识。我们报告了一项脑电图实验的结果，该实验旨在研究反应抑制在IOR中的作用。使用线索-目标设计和目标-目标设计，我们探讨了反应抑制在位置辨别任务中的作用。测量了β波功率的事件相关变化，因为振荡β活动已被证明与运动活动有关。初级运动皮层中双侧定位的源在线索和目标呈现时均显示出事件相关的β去同步化（ERD），并且在运动执行后反弹至事件相关的β同步化（ERS）。在两种设计中，IOR均源于β同步化的增强。在目标-目标设计中，IOR与β ERS的增加有关，而在线索-目标设计中与β ERD的减少有关。这些结果表明反应抑制在IOR中起着重要作用。
