注意力对视觉刺激响应的调制作用  

Modulation of Attention in Visual Stimulation Response

作　　者：韩莹[1] 许敏鹏[1,2] 柯余峰[1] 安兴伟[1,3] 孙长城[4] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]美国加州大学圣地亚哥分校神经计算学院斯沃茨计算神经科学研究中心,圣地亚哥92101 [3]德国柏林工业大学神经技术实验室,柏林10587 [4]天津市人民医院,天津300121

出　　处：《纳米技术与精密工程》2015年第5期353-358,共6页Nanotechnology and Precision Engineering

基　　金：国家自然科学基金资助项目(81222021;31271062;61172008;81171423;51007063);国家科技支撑计划资助项目(2012BAI34B02);教育部新世纪优秀人才支持计划资助项目(NCET-10-0618)

摘　　要：注意是事件相关电位(event-related potential,ERP)产生的基础,通常ERP产生于有较强随机性的自发脑电(electroencephalogram,EEG)背景中,自发脑电干扰成为提取高质量ERP信号的主要障碍.本文采用稳态刺激诱发稳态视觉诱发电位(steady state visual evoked potential,SSVEP),得到特定频率和相位调制的背景脑电,并实施不同对比度的选择性注意视觉刺激,通过比较分析所诱发产生的ERP信号波形及其P1与N1成分幅值和潜伏期变化,研究不同背景脑电及刺激强度条件下注意力对视觉刺激诱发响应的调制作用.结果表明,在特定背景脑电节律振荡与初始相位及视觉刺激对比度时,注意力对视觉刺激响应有显著调节作用,主要体现在视觉注意条件下会增加ERP中N1成分幅值并具有显著性差异,注意力对P1和N1成分的潜伏期皆无显著性差异影响.研究结果提示在设计ERP诱发实验范式时可利用注意力显著调节作用赋予背景脑电预定节律和初始相位特征,以便在ERP提取和识别时消除自发脑电干扰,获得理想研究结果.Attention is the basis of event-related potentials （ERPs）. ERP is usually induced from electroencephalogram （EEG） with strong randomness, rendering EEG a main obstacle in extracting high quality ERP signal. In this paper steady state stimulus is employed to obtain steady state visual evoked potential （SSVEP）,i. e. modulated background oscillations in specific frequency and phase, before imposing selectively attentive instant visual stimulus in different contrasts. Modulation of attention in visual stimulation response under different background oscillations and contrast of visual stimulus was studied by analyzing the induced ERP wave as well as the amplitude and latency of the P1 and N1 components. It is found that attention can significantly modulate the visual stimulation response in particular background oscillation and contrast of the instant visual stimulus. Amplitude of the N1 component is higher in visual attention than that in non-attention trails. Selective attention has little impact on the latency of P1 and N1 components. The results indicate that to extract clean ERP signal and exclude the interferences of EEG, we must pay attention to the frequency and phase of the background oscillations.

关 键 词：背景脑电 事件相关电位 视觉刺激响应 注意力调制 对比度 

分 类 号：TN911.7[电子电信—通信与信息系统] R338[电子电信—信息与通信工程]