Temporal attention enhances early visual processing:: A review and new evidence from event-related potentials
Temporal attention enhances early visual processing:: A review and new evidence from event-related potentials
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DOI：
10.1016/j.brainres.2005.11.074
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发表时间：
2006-03-03
期刊：
影响因子：
2.9
通讯作者：
Tudela, P
中科院分区：
文献类型：
--
作者：
Correa, A;Lupiáñez, J;Tudela, P
选择性注意和时间加工这两种基本的认知功能在最近的注意时间定向研究中得到了同时的探讨。一个时间定向程序可能包括一个时间模拟波斯纳的范例，这样的符号线索表明最可能的时刻，为目标的到来。行为测量表明，在预期与意外时刻出现的事件的性能得到改善。然而，有没有一致的刺激加工的轨迹在时间注意操作。因此，目前还不清楚是否早期知觉或只是后期运动过程可以调制。本文综述了ERP对时间定向的研究现状，重点讨论了在加工的早期阶段可能决定时间定向调节的因素。我们的结论是：首先，晚成分（N2和P300）一致调制的时间定向，这表明注意准备的决定和/或运动过程。第二，早期组件（例如，N1）似乎只有在任务对知觉加工要求很高时才被调制。因此，我们进行了ERP实验，旨在观察调制的早期视觉处理，通过使用一个知觉要求的任务，如字母的歧视。结果表明，第一次，目标出现在出席的时刻引起了更大的P1组件比无人值守的目标。时间注意对N2和P300的波幅和潜伏期有调制作用。这表明，时间定向的注意不仅调制后期运动加工，但也早期视觉加工时，知觉要求的任务。(c)2005 Elsevier B. V.保留所有权利。
Two fundamental cognitive functions, selective attention and processing of time, have been simultaneously explored in recent studies of temporal orienting of attention. A temporal-orienting procedure may consist of a temporal analogue to the Posner's paradigm, such that symbolic cues indicate the most probable moment for target arrival. Behavioral measures suggest that performance is improved for events appearing at expected vs. unexpected moments. However, there is no agreement on the locus of stimulus processing at which temporal attention operates. Thus, it remains unclear whether early perceptual or just late motor processes can be modulated. This article reviews current ERP research on temporal orienting, with an emphasis on factors that might determine the modulation of temporal orienting at early stages of processing. We conclude that: First, late components (N2 and P300) are consistently modulated by temporal orienting, which suggests attentional preparation of decision and/or motor processes. Second, early components (e.g., N1) seem to be modulated only when the task is highly demanding in perceptual processing. Hence, we conducted an ERP experiment which aimed to observe a modulation of early visual processing by using a perceptually demanding task, such as letter discrimination. The results show, for the first time, that targets appearing at attended moments elicited a larger P1 component than unattended targets. Moreover, temporal attention modulated the amplitude and latency of N2 and P300 components. This suggests that temporal orienting of attention not only modulates late motor processing, but also early visual processing when perceptually demanding tasks are used. (c) 2005 Elsevier B.V. All rights reserved.