Early top-down control of visual processing predicts working memory performance.

Early top-down control of visual processing predicts working memory performance.
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DOI:
10.1162/jocn.2009.21257
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发表时间:
2010-06
影响因子:
3.2
通讯作者:
Gazzaley A
Gazzaley A
中科院分区:
医学3区
文献类型:
--
作者:
Rutman AM;Clapp WC;Chadick JZ;Gazzaley A

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选择性注意对知觉记忆和工作记忆(WM)的表现都有行为上的好处,这通常归因于对感觉神经加工的自上而下的调节。然而,选择性编码过程中感觉皮层的早期活动调节与随后的工作记忆表现之间的直接关系尚未建立。为了探讨选择性注意对WM再认的影响,我们使用脑电研究了选择性延迟再认范式中自上而下调制的时间动力学。研究人员向参与者展示了重叠的、“双曝光”的人脸和自然场景图像,并要求参与者记住人脸或场景,同时忽略另一种刺激。在这里,我们提出的证据表明,参与者在选择性刺激编码过程中对早期P100(97-129ms)事件相关电位(ERP)的调制程度与他们随后的WM识别显著相关。这些结果有助于我们对注意力和记忆之间的机制重叠的不断发展的理解。
Selective attention confers a behavioral benefit for both perceptual and working memory (WM) performance, often attributed to top-down modulation of sensory neural processing. However, the direct relationship between early activity modulation in sensory cortices during selective encoding and subsequent WM performance has not been established. To explore the influence of selective attention on WM recognition, we used electroencephalography (EEG) to study the temporal dynamics of top-down modulation in a selective, delayed-recognition paradigm. Participants were presented with overlapped, “double-exposed” images of faces and natural scenes, and were instructed to either remember the face or the scene while simultaneously ignoring the other stimulus. Here, we present evidence that the degree to which participants modulate the early P100 (97–129 ms) event-related potential (ERP) during selective stimulus encoding significantly correlates with their subsequent WM recognition. These results contribute to our evolving understanding of the mechanistic overlap between attention and memory.
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