Objective assessment of the human visual attentional state.
Objective assessment of the human visual attentional state.
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客观评估人类视觉注意力状态。
DOI：
10.1007/s10633-012-9357-7
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Ludlam,DianaP
中科院分区：
文献类型：
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作者：
Willeford,KevinT;Ciuffreda,KennethJ;Yadav,NaveenK;Ludlam,DianaP
本研究的目的是建立一种利用视觉诱发电位(VEP)的α波段成分来评估人类视觉注意的客观方法。设计和方法测试了6种不同的注意条件：睁眼、闭眼、闭眼倒数和三种快速连续视觉呈现(RSVP)任务。18名视力正常的青壮年受试者(年龄21-28岁)在两个单独的日子里，在每种情况下在1米处进行了双目测试。用Diopsys™NOVA-TR系统采集视觉诱发电位，提取α波及其相关功率谱。此外，视觉搜索和注意力测试(VSAT)作为视觉注意的主观测量。结果当比较闭眼和睁眼状态时，受试者在阿尔法频段中的功率显著降低，其中闭眼状态下的功率平均是睁眼状态的两倍。其他四种条件的反应并不能反映出不同的注意要求。在较低的阿尔法频率(8-10赫兹)下，闭眼状态和睁眼状态的功率之比被发现与群体在VSAT上的表现显著相关，尤其是10赫兹成分。结论个体在视觉加工过程中削弱阿尔法成分的能力可能是其视觉注意状态的预测因子。这些发现巩固了VEPα亚组分作为视觉注意的客观电生理关联的作用，这可能在未来人类视觉注意障碍的诊断和治疗中有用。
Primary objectiveThe purpose of this study was to develop an objective way to assess human visual attention using the alpha-band component of the visual-evoked potential (VEP).Design and methodsSix different attentional conditions were tested: eyes-open, eyes-closed, eyes-closed with backwards number counting, and three rapid-serial visual presentation (RSVP) tasks. Eighteen visually normal, young-adult subjects (ages 21–28 years) were tested binocularly at 1 m for each condition on two separate days. The Diopsys™ NOVA-TR system was used to obtain the visual-evoked potential (VEP) and extracted alpha wave and its related power spectrum. Additionally, the Visual Search and Attention Test (VSAT) was administered as a subjective measure of visual attention.ResultsSubjects exhibited significant decreases in power in the alpha band when comparing the eyes-closed with the eyes-open conditions, with power in the eyes-closed condition being, on average, twice as large. The response from the other four conditions did not reflect the differential attentional demands. The ratio of the power in the eyes-closed condition to the eyes-open condition in the lower-alpha frequencies (8–10 Hz) was found to be significantly correlated with the group’s performance on the VSAT, especially the 10-Hz component.ConclusionsAn individual’s ability to attenuate their alpha component during visual processing may be a predictor of their visual attentional state. These findings solidify the role of the VEP alpha subcomponent as an objective electrophysiological correlate of visual attention, which may be useful in the diagnosis and treatment of human visual attention disorders in the future.