The magnitude of the central visual field could be detected by active middle-late processing of ERPs
The magnitude of the central visual field could be detected by active middle-late processing of ERPs
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中央视野的大小可以通过ERPs的主动中后期处理来检测
DOI：
10.1016/j.brainres.2016.07.009
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发表时间：
2016
期刊：
影响因子：
2.9
通讯作者：
Tao Luyang
中科院分区：
文献类型：
--
作者：
Li Maojuan;Liu Xiaoqin;Li Qianqian;Ji Mengmeng;Huang Wenwen;Zhang Mingyang;Wang Tao;Luo Chengliang;Wang Zufeng;Chen Xiping;Tao Luyang
本研究采用三刺激oddball范式，观察了不同中央视野条件下事件相关电位（ERP）波形的变化。以5°、10°、20°、30°视角的圆形棋盘作为靶刺激，在计算机屏幕中央设置圆形棋盘。分别分析不同刺激条件下的ERP波形。与其他三个视野水平相比，参与者对30°视野水平的反应更慢，准确性更低。ERP结果显示，在5° ~ 20°视野条件下，靶P2波幅逐渐增加，而在30°视野条件下，靶P2波幅突然下降。区域效应表明，靶P2的振幅从枕部比从颞部大。随着视野范围的扩大，靶N2的负向偏转和视觉失匹配负波（vMMN）分量有增加的趋势，靶P3的振幅也有减小的趋势，峰值潜伏期也有延长的趋势。此外，差异P3的潜伏期与目标P3的潜伏期变化趋势相似，且在30°视野水平上差异更明显。研究表明，ERP中晚期成分在一定程度上反映了视野的变化。
This study investigated the changes in event-related potential (ERP) waveforms under different central visual field conditions using a three-stimulus oddball paradigm. Circular checkerboards were presented in the center of a computer screen with a visual angle of 5°, 10°, 20°, or 30°, which were regarded as target stimuli. The ERP waveforms were analyzed separately for different stimulus conditions. Participants responded more slowly and had lower accuracy for the 30° visual field level than the other three visual field levels. The ERP results revealed that the amplitudes of target P2 gradually increased from the 5° to 20° visual field conditions, while they decreased abruptly in the 30° visual field condition. Regional effects showed that the amplitudes of target P2 were larger from the occipital electrodes than that from the temporal sites. Besides the negative-going deflection of target N2 and visual mismatch negativity (vMMN) components having an increasing tendency with expansion of the visual field, there was also a trend that the amplitudes of target P3 were decreased and the peak latencies were prolonged with increasing visual field ranges. In addition, the latencies of the difference P3 had a similar trend to the latencies of the target P3, and all the differences were more obvious at the 30° visual field level. The study demonstrated that middle-late components of ERPs can reflect changes in the visual field to some extent.