Lateralized responses during covert attention are modulated by target eccentricity
Lateralized responses during covert attention are modulated by target eccentricity
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DOI：
10.1016/j.neulet.2011.01.003
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发表时间：
2011-03-10
影响因子：
2.5
通讯作者：
van Gerven, Marcel A. J.
中科院分区：
文献类型：
--
作者：
Bahramisharif, Ali;Heskes, Tom;van Gerven, Marcel A. J.
各种研究表明，对视野中不同位置的内隐注意可以用作脑机接口的控制信号。众所周知，当内隐注意指向左视半野时，右半球的后α活动减少，同时左半球增加，反之亦然。然而，它仍然是未知的，如果以及如何经典的偏侧化模式取决于偏心的位置，其中一个出席。在本文中，我们研究了目标偏心率对由内隐注意驱动的脑-机接口系统性能的影响。结果表明，偏侧化模式变得更加明显的目标偏心率增加，并建议在当前的设计中，具有可接受的分类性能的两个目标，在固定在相对的半野相同的距离的最小偏心率约为6度的视角。(C)2011爱思唯尔爱尔兰有限公司保留所有权利。
Various studies have demonstrated that covert attention to different locations in the visual field can be used as a control signal for brain computer interfacing. It is well known that when covert attention is directed to the left visual hemifield, posterior alpha activity decreases in the right hemisphere while simultaneously increasing in the left hemisphere and vice versa. However, it remains unknown if and how the classical lateralization pattern depends on the eccentricity of the locations to which one attends. In this paper we study the effect of target eccentricity on the performance of a brain computer interface system that is driven by covert attention. Results show that the lateralization pattern becomes more pronounced as target eccentricity increases and suggest that in the current design the minimum eccentricity for having an acceptable classification performance for two targets at equal distance from fixation in opposite hemifields is about 6 degrees of visual angle. (C) 2011 Elsevier Ireland Ltd. All rights reserved.