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421.
The present study used event related potentials (ERPs) in a spatial cueing procedure to investigate the stages of processing influenced by intervening events presented between cues and targets, when they produce maximal behavioural modulations (i.e., facilitation in the absence of the intervening event, and inhibition of return – IOR, when the intervening event is presented). Our data challenge the traditional orienting–reorienting hypothesis, leading to alternative explanations of cueing effects that are beyond the orienting of attention. Peripheral cues always produced a detection cost (reflected in a reduced amplitude of the P100 component for cued as compared to uncued trials), independently on the behavioural effect that was measured. In contrast, facilitation was associated to modulations of later-stage components, such as N100, Nd, and P300. The N2pc component, usually associated to spatial selection, was the only component reflecting opposite and significant modulations associated to the behavioural effect. The present results suggest that facilitation and IOR can arise from changes at different stages of processing. We propose that the perceptual detection cost (reflected on the P100), and the hindered spatial selection (reflected on the N2pc) at the cued location determine the IOR effect at least in discrimination tasks, while the contribution of the later-stage components, beside attentional processes, determines other facilitatory effects of cueing, which altogether determine the behavioural effect that is measured. 相似文献
422.
This study examines the relation between the error-related negativity (ERN) and post-error behavior over time in healthy young adults (N=61). Event-related brain potentials were collected during two sessions of an identical flanker task. Results indicated changes in ERN and post-error accuracy were related across task sessions, with more negative ERN associated with greater improvements in post-error accuracy. This relationship was independent of any cross-sectional relationships between overall task performance, individual difference factors, including personality and self-efficacy, and indices of self-regulatory action monitoring. These results indicate that the relation between ERN and post-error accuracy remains intact and consistent regardless of variation in this set of individual difference factors previously associated with both of these indices of self-regulatory action monitoring, providing support for the strength, robustness, and persistence of this relationship in the process of adaptively controlling behavior to enhance task performance. 相似文献