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首页> 外文期刊>The European Journal of Neuroscience >The strength of anticipatory spatial biasing predicts target discrimination at attended locations: a high-density EEG study.
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The strength of anticipatory spatial biasing predicts target discrimination at attended locations: a high-density EEG study.

机译：预期的空间偏见的强度可预测出勤地点的目标歧视：一项高密度脑电图研究。

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摘要

Cueing relevant spatial locations in advance of a visual target results in modulated processing of that target as a consequence of anticipatory attentional deployment, the neural signatures of which remain to be fully elucidated. A set of electrophysiological processes has been established as candidate markers of the invocation and maintenance of attentional bias in humans. These include spatially-selective event-related potential (ERP) components over the lateral parietal (around 200-300 ms post-cue), frontal (300-500 ms) and ventral visual (> 500 ms) cortex, as well as oscillatory amplitude changes in the alpha band (8-14 Hz). Here, we interrogated the roles played by these anticipatory processes in attentional orienting by testing for links with subsequent behavioral performance. We found that both target discriminability (d') and reaction times were significantly predicted on a trial-by-trial basis by lateralization of alpha-band amplitude in the 500 ms preceding the target, with improved speed and accuracy resulting from a greater relative decrease in alpha over the contralateral visual cortex. Reaction time was also predicted by a late posterior contralateral positivity in the broad-band ERP in the same time period, but this did not influence d'. In a further analysis we sought to identify the control signals involved in generating the anticipatory bias, by testing earlier broad-band ERP amplitude for covariation with alpha lateralization. We found that stronger alpha biasing was associated with a greater bilateral frontal positivity at approximately 390 ms but not with differential amplitude across hemispheres in any time period. Thus, during the establishment of an anticipatory spatial bias, while the expected target location is strongly encoded in lateralized activity in parietal and frontal areas, a distinct non-spatial control process seems to regulate the strength of the bias.
机译：由于预期注意力的部署，在视觉目标之前提示相关的空间位置会导致对该目标的调制处理，其神经特征仍有待充分阐明。已经建立了一组电生理过程作为人类注意偏见的调用和维持的候选标记。这些包括空间选择性事件相关电位（ERP）分量在顶壁（提示后约200-300 ms），额叶（300-500 ms）和腹侧视觉（> 500 ms）皮层上，以及振荡幅度阿尔法频段（8-14 Hz）的变化。在这里，我们通过测试与后续行为表现的联系，审视了这些预期过程在注意定向中的作用。我们发现，通过在目标之前500毫秒内对α波段幅度进行侧向化，可以在逐次试验的基础上显着预测目标可分辨性（d'）和反应时间，并且由于相对降低幅度更大，提高了速度和准确性在对侧视觉皮层的alpha中。在同一时间段，宽带ERP的后侧对侧阳性也可以预测反应时间，但这并不影响d'。在进一步的分析中，我们试图通过测试较早的宽带ERP振幅与alpha偏侧化的协方差，来确定与产生预期偏差有关的控制信号。我们发现，在任何时间段内，更强的alpha偏向与大约390 ms处更大的双侧额叶阳性相关，但与半球上的幅度差异无关。因此，在建立预期的空间偏差的过程中，虽然预期的目标位置在顶叶和额叶区域的侧向活动中被强烈编码，但独特的非空间控制过程似乎可以调节偏差的强度。

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