Eimer M
Department of Psychology, Birkbeck College, University of London, Malet Street, WC1E 7HX, London, UK.
Biol Psychol. 2000 Jul;53(2-3):253-8. doi: 10.1016/s0301-0511(00)00049-1.
To study differences in the time course of attentional orienting triggered by salient peripheral events and by central symbolic precues, event-related brain potentials (ERPs) were recorded in response to letter stimuli following spatially informative symbolic or peripheral precues after a cue-target interval (CTI) of either 200 or 700 ms. Stimuli at cued (attended) locations elicited an enhanced negativity relative to stimuli at uncued locations. With short CTIs, these effects started around 150 ms post-stimulus for peripheral cues. They were delayed by about 100 ms for central cues. This latency difference is assumed to reflect fast exogenous orienting elicited by peripheral, but not by central cues. Beyond 200 ms post-stimulus, attentional negativities were larger with long CTIs than with short CTIs for both cue types, presumably related to the gradual build-up of endogenous orienting triggered by spatially predictive events.
为了研究由显著的外周事件和中央符号预示引发的注意定向时间进程的差异，在200毫秒或700毫秒的提示-目标间隔（CTI）后，针对空间信息性符号或外周预示之后的字母刺激，记录事件相关脑电位（ERP）。与未提示位置的刺激相比，提示（被关注）位置的刺激引发了增强的负波。对于短CTI，外周预示的这些效应在刺激后约150毫秒开始。中央预示的效应延迟约100毫秒。这种潜伏期差异被认为反映了由外周而非中央预示引发的快速外源性定向。在刺激后200毫秒之后，两种提示类型的长CTI的注意负波都比短CTI时更大，这可能与由空间预测事件引发的内源性定向的逐渐形成有关。
