Eimer M
Universität München, Institut für Psychologie, München, Germany.
Psychophysiology. 1996 Jan;33(1):13-21. doi: 10.1111/j.1469-8986.1996.tb02104.x.
Two experiments investigated selective processing as a result of transient and sustained visual-spatial attention. In Experiment 1, attention was cued on a trial-by-trial basis and event-related brain potentials were measured to stimuli preceded by valid, invalid, or neutral symbolic precues. Trial validity had only small effects on posterior P1 and N1 components. At midline electrodes, an enhanced negativity for valid as compared with invalid trials was present, which appeared to reflect initial processing costs for invalid trials followed by an additional processing benefit for valid trials. Experiment 2 investigated whether these effects are specific for transient spatial attention by comparing transient and sustained attention conditions. No indication of early processing costs was found in the latter case.
两项实验研究了由瞬态和持续视觉空间注意所导致的选择性加工。在实验1中，逐次试验地对注意进行提示，并测量与有效、无效或中性符号预提示之后呈现的刺激相关的脑电活动。试验有效性对后部P1和N1成分仅有微小影响。在中线电极处，与无效试验相比，有效试验存在增强的负波，这似乎反映了无效试验的初始加工成本，随后是有效试验的额外加工益处。实验2通过比较瞬态和持续注意条件，研究了这些效应是否特定于瞬态空间注意。在后一种情况下未发现早期加工成本的迹象。
