Combined expectancies: event-related potentials reveal the early benefits of spatial attention that are obscured by reaction time measures.
Combined expectancies: event-related potentials reveal the early benefits of spatial attention that are obscured by reaction time measures.
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DOI：
10.1037//0096-1523.27.2.303
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发表时间：
2001-04
期刊：
影响因子：
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通讯作者：
T. Handy;Vanessa A. Green;R. Klein;G. Mangun
中科院分区：
文献类型：
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作者：
T. Handy;Vanessa A. Green;R. Klein;G. Mangun
视觉空间注意力被比作一个“聚光灯”，选择性地促进知觉处理的事件在秘密出席的地点。然而，如果参与者事先知道一个即将到来的目标的可能位置和可能的反应，它将需要，促进响应性能不会发生在预期（或出席）的位置，需要一个意想不到的反应的目标。在辨别任务中记录事件相关电位（ERPs），在该任务中，最可能的目标位置和目标反应在目标开始之前被同时提示。ERPs显示，在参加地点的所有目标的增强感知级处理的证据。这些结果表明，缺乏反应促进意想不到的目标，在出席的地点可能是由于后知觉的过程中，包括非空间刺激的期望，响应期望，或两者激活。
Visual spatial attention has been likened to a "spotlight" that selectively facilitates the perceptual processing of events at covertly attended locations. However, if participants have advance knowledge of the likely location of an impending target and the likely response it will require, facilitation in response performance does not occur for targets at the expected (or attended) location that require an unexpected response. Event-related potentials (ERPs) were recorded during a discrimination task in which the most likely target location and target response were simultaneously cued prior to target onset. The ERPs showed evidence of enhanced perceptual-level processing for all targets at attended locations. These results suggest that the lack of response facilitation for unexpected targets at attended locations is likely due to postperceptual processes that are activated by the inclusion of nonspatial stimulus expectancies, response expectancies, or both.