Sessa P, Luria R, Verleger R, Dell'Acqua R
Department of Developmental Psychology, University of Padova, Via Venezia 8, 35131 Padua, Italy.
Brain Res. 2007 Mar 16;1137(1):131-9. doi: 10.1016/j.brainres.2006.12.066. Epub 2006 Dec 29.
A rapid serial visual presentation technique was used to display sequentially two targets, T1 and T2, and monitor P3 amplitude and latency variations associated with the attentional blink (AB) effect. A red T1 digit was embedded on each trial in a sequence of black letters. T2 was either masked by a trailing stimulus or not masked. T1 had to be identified on a proportion of trials, or ignored in other trials. T2 was the black letter 'E' on 20% of the trials, or any other non-'E' black letter in the other 80% of the trials. A delayed 'E' detection task was required at the end of each trial. An AB was observed when T1 had to be reported and T2 was masked. The AB effect was associated with a sizable amplitude reduction of the P3 component time locked to T2 onset. When T2 was not masked, no AB or P3 amplitude variations were observed. When T1 had to be reported, a delayed P3 peak latency was observed at short compared to long T1-T2 intervals. No effect of T1-T2 interval was observed on the T2-locked P3 peak latency when T1 could be ignored. Taken together these findings provide converging evidence in support of temporal attention models bridging behavior and electrophysiology that postulate a direct link between the cause of the AB effect and the sources of both amplitude and latency variations in the T2-locked P3 component.
采用快速序列视觉呈现技术依次显示两个目标T1和T2，并监测与注意瞬脱（AB）效应相关的P3波幅和潜伏期变化。在每个试验中，一个红色的T1数字嵌入在一串黑色字母序列中。T2要么被尾随刺激所掩蔽，要么不被掩蔽。在一部分试验中需要识别T1，而在其他试验中则忽略T1。在20%的试验中，T2是黑色字母“E”，在其他80%的试验中，T2是任何其他非“E”的黑色字母。在每个试验结束时需要进行一个延迟的“E”检测任务。当必须报告T1且T2被掩蔽时，观察到注意瞬脱现象。注意瞬脱效应与锁定在T2开始时刻的P3成分波幅显著降低有关。当T2未被掩蔽时，未观察到注意瞬脱或P3波幅变化。当必须报告T1时，与长T1-T2间隔相比，在短T1-T2间隔时观察到延迟的P3峰潜伏期。当可以忽略T1时，未观察到T1-T2间隔对锁定在T2的P3峰潜伏期有影响。这些研究结果共同提供了一致的证据，支持将行为和电生理学联系起来的时间注意模型，该模型假设注意瞬脱效应的原因与锁定在T2的P3成分的波幅和潜伏期变化源之间存在直接联系。
