Switch-specific and general preparation map onto different ERP components in a task-switching paradigm
Switch-specific and general preparation map onto different ERP components in a task-switching paradigm
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DOI：
10.1111/j.1469-8986.2010.01115.x
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发表时间：
2011-04-01
期刊：
影响因子：
3.7
通讯作者：
Heathcote, Andrew
中科院分区：
文献类型：
--
作者：
Karayanidis, Frini;Provost, Alexander;Heathcote, Andrew
我们研究了线索锁定的中央顶叶阳性是否与开关特异性或一般准备过程有关。如果这种正性（300-400 ms）是指开关特异性准备，那么与较小RT开关成本相关的快速开关试验应该比较慢的开关试验具有更大的正性，但对于重复试验来说，这种关联不应该很明显。在切换和重复条件下，我们提取了对应于每个参与者RT分布的半十分位数的ERP波形（即试验中最快到最慢的5%）。与开关特异性准备过程一致，中枢顶叶正振幅与较慢的RT和较大的RT切换成本有关，但与重复试验无关。在转换和重复试验中，较晚的靶前阴性反应（500-600 ms）与RT呈负相关，这与一般的预期准备过程一致。
We examined whether the cue-locked centroparietal positivity is associated with switch-specific or general preparation processes. If this positivity (300-400 ms) indexes switch-specific preparation, faster switch trials associated with smaller RT switch cost should have a larger positivity as compared to slower switch trials, but no such association should be evident for repeat trials. We extracted ERP waveforms corresponding to semi-deciles of each participant's RT distribution (i.e., fastest to slowest 5% of trials) for switch and repeat conditions. Consistent with a switch-specific preparation process, centroparietal positivity amplitude was linked to slower RT and larger RT switch cost for switch but not repeat trials. A later pre-target negativity (500-600 ms) was inversely correlated with RT for both switch and repeat trials, consistent with a general anticipatory preparation processes.