Earliest stages of visual cortical processing are not modified by attentional load
Earliest stages of visual cortical processing are not modified by attentional load
复制标题
视觉皮层处理的最早阶段不会因注意力负荷而改变
DOI：
10.1002/hbm.22381
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发表时间：
2014-07-01
影响因子：
4.8
通讯作者：
Hillyard, Steven A.
中科院分区：
文献类型：
--
作者：
Ding, Yulong;Martinez, Antigona;Hillyard, Steven A.
本研究采用高密度事件相关电位（ERP）记录技术，研究了注意负荷对正常成年人头皮神经元对注意和无关视觉刺激反应的影响。周边（上，下视野）和中央刺激以随机顺序在一个快速的速度，而受试者对中央刺激中的目标作出反应。颜色检测和颜色方向的连接搜索任务被用作低负荷和高负荷的任务，分别。行为结果表明，目标检测的准确性和反应时间显着的负载效应。ERP结果显示，无论是中央相关或周边无关的刺激诱发的初始C1成分（60-100毫秒）没有显着的负荷效应。偶极子模型的源分析证实了先前的报告，C1包括初级视觉皮层的初始诱发反应。来源分析表明，高注意力负荷增强了腹外侧纹外皮质对中枢相关刺激的早期（70-140 ms）神经反应，而对外周无关刺激处理的负荷效应在110 ms开始，并局限于更多的背侧和前部纹外皮质区域。这些结果提供了证据表明，视觉皮层加工的最早阶段没有被注意负荷的修改，并显示注意负荷以不同的方式影响任务相关和不相关的刺激的加工。《脑图》35：3008-3024，2014年。(c)2013 Wiley Periodicals，Inc.
This study investigated the effects of attentional load on neural responses to attended and irrelevant visual stimuli by recording high-density event-related potentials (ERPs) from the scalp in normal adult subjects. Peripheral (upper and lower visual field) and central stimuli were presented in random order at a rapid rate while subjects responded to targets among the central stimuli. Color detection and color-orientation conjunction search tasks were used as the low- and high-load tasks, respectively. Behavioral results showed significant load effects on both accuracy and reaction time for target detections. ERP results revealed no significant load effect on the initial C1 component (60-100 ms) evoked by either central-relevant or peripheral-irrelevant stimuli. Source analysis with dipole modeling confirmed previous reports that the C1 includes the initial evoked response in primary visual cortex. Source analyses indicated that high attentional load enhanced the early (70-140 ms) neural response to central-relevant stimuli in ventral-lateral extrastriate cortex, whereas load effects on peripheral-irrelevant stimulus processing started at 110 ms and were localized to more dorsal and anterior extrastriate cortical areas. These results provide evidence that the earliest stages of visual cortical processing are not modified by attentional load and show that attentional load affects the processing of task relevant and irrelevant stimuli in different ways. Hum Brain Mapp 35:3008-3024, 2014. (c) 2013 Wiley Periodicals, Inc.