Functional Neuroimaging Laboratory, School of Psychology and Centre for Brain and Mental Health Research, University of Newcastle, Callaghan, Australia.
Psychophysiology. 2011 Apr;48(4):559-68. doi: 10.1111/j.1469-8986.2010.01115.x. Epub 2010 Aug 16.
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.
我们考察了线索锁时的中央顶区正波是否与转换特异性或一般性准备过程相关。如果这个正波（300-400ms）反映了转换特异性准备，那么与较慢的转换试次相比，与较快的转换试次相关的 RT 转换代价应该更小，并且这种关联在重复试次中不应明显。我们为每个参与者的 RT 分布的半十位数（即最快到最慢的 5%的试次）提取了对应于转换和重复条件的 ERP 波。与转换特异性准备过程一致，中央顶区正波幅度与转换试次的较慢 RT 和较大 RT 转换代价相关，但与重复试次无关。一个较晚的前靶负波（500-600ms）与转换和重复试次的 RT 呈负相关，这与一般性的预期准备过程一致。
