Attention extracts signal in external noise: a BOLD fMRI study.

Attention extracts signal in external noise: a BOLD fMRI study.
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DOI:
10.1162/jocn.2010.21511
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发表时间:
2011-05
影响因子:
3.2
通讯作者:
Chu W
Chu W
中科院分区:
医学3区
文献类型:
--
作者:
Lu ZL;Li X;Tjan BS;Dosher BA;Chu W

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基于行为研究的结果,即空间注意改善了目标区域对外部噪声的排斥,我们预测,注意空间区域将减少外部噪声对相应皮层区域BOLD反应的影响,这被视为在大量外部噪声但相对低信号的条件下减少的BOLD反应,以及BOLD响应于信号对比度变化的动态范围增加。我们发现,在存在外部噪声的情况下,在V1的低信号对比度条件下,内隐注意减少了15.5-18.9%的逐次试验BOLD反应。它还将V1、V2、V3、V3 A/B和V4中的BOLD动态范围增加了至少三倍。总的来说,在这些早期视觉区域,内隐注意减少了大约73-85%的外部噪音的影响。它还将对比度增益提高了2.6-3.8倍。
On the basis of results from behavioral studies that spatial attention improves the exclusion of external noise in the target region, we predicted that attending to a spatial region would reduce the impact of external noise on the BOLD response in corresponding cortical areas, seen as reduced BOLD responses in conditions with large amounts of external noise but relatively low signal, and increased dynamic range of the BOLD response to variations in signal contrast. We found that, in the presence of external noise, covert attention reduced the trial-by-trial BOLD response by 15.5–18.9% in low signal contrast conditions in V1. It also increased the BOLD dynamic range in V1, V2, V3, V3A/B, and V4 by a factor of at least three. Overall, covert attention reduced the impact of external noise by about 73–85% in these early visual areas. It also increased the contrast gain by a factor of 2.6–3.8.
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