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首页> 外文期刊>The European Journal of Neuroscience >Isolating endogenous visuo-spatial attentional effects using the novel visual-evoked spread spectrum analysis (VESPA) technique.
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Isolating endogenous visuo-spatial attentional effects using the novel visual-evoked spread spectrum analysis (VESPA) technique.

机译：使用新型视觉诱发的扩频分析（VESPA）技术隔离内源性视觉空间注意力效应。

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In natural visual environments, we use attention to select between relevant and irrelevant stimuli that are presented simultaneously. Our attention to objects in our visual field is largely controlled endogenously, but is also affected exogenously through the influence of novel stimuli and events. The study of endogenous and exogenous attention as separate mechanisms has been possible in behavioral and functional imaging studies, where multiple stimuli can be presented continuously and simultaneously. It has also been possible in electroencephalogram studies using the steady-state visual-evoked potential (SSVEP); however, it has not been possible in conventional event-related potential (ERP) studies, which are hampered by the need to present suddenly onsetting stimuli in isolation. This is unfortunate as the ERP technique allows for the analysis of human physiology with much greater temporal resolution than functional magnetic resonance imaging or the SSVEP. While ERP studies of endogenous attention have been widely reported, these experiments have a serious limitation in that the suddenly onsetting stimuli, used to elicit the ERP, inevitably have an exogenous, attention-grabbing effect. Recently we have shown that it is possible to derive separate event-related responses to concurrent, continuously presented stimuli using the VESPA (visual-evoked spread spectrum analysis) technique. In this study we employed an experimental paradigm based on this method, in which two pairs of diagonally opposite, non-contiguous disc-segment stimuli were presented, one pair to be ignored and the other to be attended. VESPA responses derived for each pair showed a strong modulation at 90-100 ms (during the visual P1 component), demonstrating the utility of the method for isolating endogenous visuo-spatial attention effects.
机译：在自然的视觉环境中，我们会注意在同时显示的相关和不相关刺激之间进行选择。我们对视野中对象的注意力在很大程度上是内生地控制的，但也受到新的刺激和事件的影响而外生地受到影响。作为行为和功能成像研究中的独立机制，对内源性和外源性注意力的研究已经成为可能，在该研究中，可以连续且同时显示多个刺激。使用稳态视觉诱发电位（SSVEP）在脑电图研究中也有可能。然而，在传统的事件相关电位（ERP）研究中却是不可能的，传统的事件相关电位（ERP）研究因需要单独呈现突然发作的刺激而受阻。这是不幸的，因为ERP技术允许以比功能磁共振成像或SSVEP更高的时间分辨率分析人类生理。尽管已经广泛报道了内源性注意力的ERP研究，但是这些实验存在严重的局限性，因为用于引发ERP的突然发作的刺激不可避免地具有外源性的，引人注意的效果。最近，我们已经表明，使用VESPA（视觉诱发的扩频分析）技术，可以得出对并发的，连续呈现的刺激的独立事件相关响应。在这项研究中，我们采用了一种基于这种方法的实验范式，其中提出了两对对角相对的，非连续的椎间盘节段刺激，其中一对被忽略，另一对则受到关注。每对派生的VESPA响应在90-100毫秒（在视觉P1分量期间）显示出强烈的调制，证明了该方法可用于隔离内源性视觉空间注意力效应。

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