Wang Min, Yang Ping, Zhao Qian-Jing, Wang Meng, Jin Zhenlan, Li Ling
Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
Front Hum Neurosci. 2016 Feb 18;10:57. doi: 10.3389/fnhum.2016.00057. eCollection 2016.
In task-switching paradigms, reaction times (RTs) switch cost (SC) and the neural correlates underlying the SC are affected by different preparation intervals. However, little is known about the effect of the preparation interval on the repetition processes in task-switching. To examine this effect we utilized a cued task-switching paradigm with long sequences of repeated trials. Response-stimulus intervals (RSI) and cue-stimulus intervals (CSI) were manipulated in short and long conditions. Electroencephalography (EEG) and behavioral data were recorded. We found that with increasing repetitions, RTs were faster in the short CSI conditions, while P3 amplitudes decreased in the LS (long RSI and short CSI) conditions. Positive correlations between RT benefit and P3 activation decrease (repeat 1 - repeat 5), and between the slope of the RT and P3 regression lines were observed only in the LS condition. Our findings suggest that differential preparation intervals modulate repetition processes in task switching.
在任务切换范式中，反应时间（RTs）、切换成本（SC）以及SC背后的神经关联会受到不同准备间隔的影响。然而，关于准备间隔对任务切换中重复过程的影响却知之甚少。为了研究这种影响，我们采用了一种带有长序列重复试验的线索任务切换范式。在短条件和长条件下对反应-刺激间隔（RSI）和线索-刺激间隔（CSI）进行了操控。记录了脑电图（EEG）和行为数据。我们发现，随着重复次数的增加，在短CSI条件下RTs更快，而在LS（长RSI和短CSI）条件下P3波幅减小。仅在LS条件下观察到RT获益与P3激活降低（重复1 - 重复5）之间以及RT和P3回归线斜率之间存在正相关。我们的研究结果表明，不同的准备间隔会调节任务切换中的重复过程。
