Electrophysiological evidence for attentional guidance by the contents of working memory
Electrophysiological evidence for attentional guidance by the contents of working memory
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DOI：
10.1111/j.1460-9568.2009.06805.x
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发表时间：
2009-07-01
影响因子：
3.4
通讯作者：
Humphreys, Glyn W.
中科院分区：
文献类型：
--
作者：
Kumar, Sanjay;Soto, David;Humphreys, Glyn W.
视觉注意的部署可以被与工作记忆（WM）内容相匹配的刺激强烈调节，即使工作记忆内容对表现有害，并且显著的自下而上的线索定义了关键目标[D]。索托等。（2006）视觉研究，46(10):1010-1018。在这里，我们研究了WM对人类早期注意力引导的电生理相关。研究人员给了观察者一个素数，让他们识别或记住。随后，他们必须在不同的干扰线中寻找一条目标线。每条线嵌入四个物体中的一个，其中一个分心物体可以匹配WM中持有的刺激。行为数据显示，记忆中的启动项对表现的影响比仅仅识别启动项对表现的影响更大。目标选择效率的电生理测量（N2pc）也受到WM中项目与搜索任务中目标位置的匹配程度的影响。当目标与重新呈现的（无效）启动在同一视野中时，N2pc增强，而当启动在搜索显示中没有再次出现时（在中性试验中），以及当启动在目标的对侧时。仅仅确定质数对N2pc成分没有影响。有证据表明，WM调节了视野中物体之间的竞争性相互作用，从而决定了目标选择的效率。
The deployment of visual attention can be strongly modulated by stimuli matching the contents of working memory (WM), even when WM contents are detrimental to performance and salient bottom-up cues define the critical target [D. Soto et al. (2006)Vision Research, 46, 1010-1018]. Here we investigated the electrophysiological correlates of this early guidance of attention by WM in humans. Observers were presented with a prime to either identify or hold in memory. Subsequently, they had to search for a target line amongst different distractor lines. Each line was embedded within one of four objects and one of the distractor objects could match the stimulus held in WM. Behavioural data showed that performance was more strongly affected by the prime when it was held in memory than when it was merely identified. An electrophysiological measure of the efficiency of target selection (the N2pc) was also affected by the match between the item in WM and the location of the target in the search task. The N2pc was enhanced when the target fell in the same visual field as the re-presented (invalid) prime, compared with when the prime did not reappear in the search display (on neutral trials) and when the prime was contralateral to the target. Merely identifying the prime produced no effect on the N2pc component. The evidence suggests that WM modulates competitive interactions between the items in the visual field to determine the efficiency of target selection.