Early top-down influences on bistable perception revealed by event-related potentials
Early top-down influences on bistable perception revealed by event-related potentials
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DOI：
10.1016/j.bandc.2007.10.004
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发表时间：
2008-06-01
影响因子：
2.5
通讯作者：
Nerger, Janice L.
中科院分区：
文献类型：
--
作者：
Pitts, Michael A.;Gavin, William J.;Nerger, Janice L.
关于自下而上与自上而下对认知的影响，文献中存在着长期的争论。最近，已经开发出一种技术来测量与知觉逆转相关的大脑活动（通过ERP）的早期变化（Kornmeier & Bach，2004）。一个ERP组件，反转负性（RN）已被确定，其特征在于增加负电位超过后头皮从150至350毫秒的知觉反转相比，知觉稳定性。这一发现虽然有趣，但并没有帮助解决自下而上与自上而下辩论相关的问题，因为自上而下的影响没有被直接操纵。目前的研究集中在解决这些问题，通过测量RN，而观察员保持三个“有意的方法”之一，（1）试图扭转知觉，尽可能经常，（2）试图稳定知觉，尽可能长的时间，（3）保持被动的方法。增强RN幅度被发现的意图，以扭转条件相比，被动条件。这一发现表明，自上而下的控制的早期影响（150毫秒）的知觉逆转的图形。结果进行了讨论，在竞争性的注意力转移与疲劳为基础的理论的感知。(C)2007年爱思唯尔公司All rights reserved.
A longstanding debate exists in the literature concerning bottom-up vs. top-down influences on bistable perception. Recently, a technique has been developed to measure early changes in brain activity (via ERPs) related to perceptual reversals (Kornmeier & Bach, 2004). An ERP component, the reversal negativity (RN) has been identified, and is characterized as an increase in negative potential over the posterior scalp from 150 to 350 ms for perceptual reversals compared to perceptual stability. This finding, although interesting, has not helped resolve issues related to the bottom-up vs. top-down debate because top-down influences have not been directly manipulated. The current study focused on resolving some of these issues by measuring the RN while observers maintained one of three 'intentional approaches', (1) try to reverse perception as often as possible, (2) try to stabilize perception for as long as possible, and (3) maintain a passive approach. Enhancements in RN amplitude were found for the intention-to-reverse condition compared to the passive condition. This finding suggests an early influence (150 ms) of top-down control on perceptual reversals of bistable figures. Results are discussed in terms of competing attention shifting vs. fatigue-based theories of bistable perception. (C) 2007 Elsevier Inc. All rights reserved.