Ko Yao-Ting, Cheng Shih-Kuen, Juan Chi-Hung
Institute of Cognitive Neuroscience, National Central University, Jhongli, Taiwan,
Psychol Res. 2015 Mar;79(2):249-58. doi: 10.1007/s00426-014-0567-3. Epub 2014 Apr 10.
According to the race models of the stop-signal paradigm, stopping success (successful vs. unsuccessful stopping) is attributed to the finishing times of a go and a stop process. In addition to those factors involving processing times, in the present study we sought to use electrophysiological measures to find factors involving activations that could affect stopping success. We hypothesized that voluntarily-generated unimanual preparation would be a factor. To assess voluntarily-generated unimanual preparation in the stop-signal paradigm, we used a selective-stopping task without any precue. The selective-stopping task also allowed us to assess reaction times (RTs) even when stopping was successful. We demonstrated shorter RTs in signal-respond (i.e., unsuccessful stopping) than in signal-inhibit (successful stopping) trials, as is predicted by the race models. More importantly, we also demonstrated different pre-signal lateralized readiness potentials between the two types of trials and larger lateralized mu ERD in signal-respond than in signal-inhibit trials, suggesting that voluntarily-generated unimanual preparation affects stopping success. In addition to what is described in the race models of the stop-signal paradigm, the present results therefore demonstrated measures of pre-signal activations that could influence stopping success.
根据停止信号范式的竞争模型，停止成功（成功停止与未成功停止）归因于执行和停止过程的完成时间。除了那些涉及处理时间的因素外，在本研究中，我们试图使用电生理测量方法来寻找涉及激活的因素，这些因素可能会影响停止成功。我们假设自发产生的单手准备是一个因素。为了在停止信号范式中评估自发产生的单手准备，我们使用了一种没有任何预线索的选择性停止任务。选择性停止任务还使我们能够在停止成功时评估反应时间（RT）。正如竞争模型所预测的，我们证明在信号反应（即未成功停止）试验中的反应时间比在信号抑制（成功停止）试验中更短。更重要的是，我们还证明了两种试验类型之间信号前的侧化准备电位不同，并且信号反应试验中的侧化μ波事件相关去同步化比信号抑制试验中更大，这表明自发产生的单手准备会影响停止成功。因此，除了停止信号范式竞争模型中所描述的内容外，本研究结果还证明了信号前激活的测量方法可能会影响停止成功。
