听觉刺激对稳态视觉诱发电位影响研究

基于稳态视觉诱发电位(steady state visual evoked potential,SSVEP)和听觉脑机接口技术目前已成为研究重点.未来的挑战是研究基于视觉和听觉联合统一系统框架的脑机接口技术.多感觉在不同脑区间存在的跨膜整合以及视听双刺激的交互作用,给该技术研究带来较大困难,故研究听觉刺激对枕区SSVEP影响很有意义.在闪光刺激频率为12 Hz,占空比分别为5％、20％、30％、40％、50％、60％、70％、80％、95％条件下,分别加入500、1 000、1 500 Hz的正弦纯音、响度为50 dB的听觉刺激,研究听觉对SSVEP的变化规律.结果表明,对同一受试者,视听双刺激条件下SSVEP随占空比变化依然呈现“窗口”效应,听觉刺激对SSVEP影响起增强或抑制作用.此外听觉刺激对SSVEP影响出现的占空比“窗口”的位置、数量以及对SSVEP增强或抑制作用的程度也因人而已.结果为更好研究视听相互作用机理及其在脑机接口技术应用提供有意义的实验依据.

Effect of auditory stimulation on steady state visual evoked potentials

Steady state visual evoked potential (SSVEP) is widely used in brain interface and medical clinical diagnosis when the lock is locked and the signal to noise ratio and transmission rate are higher.The interaction between auditory and visual stimuli has great influence on brain cognition and its application.Therefore,it is very meaningful to study the effect of auditory stimulation on SSVEP.At the frequency of 12 Hz,20％,30％,40％,50％,60％,70％,80％ and 95 ％ of the light stimulation frequency,respectively,add 500,1 000,1 500Hz sine pure tone,loudness of 50 dB of auditory stimulation,the study of SSVEP changes in the law.The results showed that SSVEP showed a "window" effect with the change of duty cycle in the same subjects,and the effect of auditory stimulation on SSVEP was enhanced or inhibited.In addition,the position,number,and degree of enhancement or inhibition of the "window" of the auditory stimulus impact on SSVEP is also due to the fact that SSVEP is enhanced or inhibited.The results provide a meaningful experimental basis for better study of the mechanism of interaction between brain and brain signals produced by visual and auditory stimuli.