双模态稳态诱发脑电刺激系统设计  

Design of bimodal steady-state evoked EEG stimulus system

作　　者：陈妮 罗晓春 Chen Ni;Luo Xiaochun(Life Sciences Institute,Guangxi Medical University,Nanning 530021,China;Equipment Department,Guangxi Guigang People’s Hospital,Guigang 537100,China)

机构地区：[1]广西医科大学生命科学研究院,广西南宁530021 [2]广西贵港市人民医院设备科,广西贵港537100

出　　处：《电子技术应用》2024年第8期48-53,共6页Application of Electronic Technique

基　　金：国家自然科学基金项目(62361007)。

摘　　要：稳态诱发脑电具有频率标签特性,在大脑的感知和认知研究中具有广泛应用。利用双模态刺激可以探索两类感知功能之间的相互影响。为此,设计一个集成视觉和听觉模态的周期性感觉刺激系统。系统以STM32F103RC为核心,控制AD9959输出两路正弦信号,输出信号经过七阶低通滤波电路和十倍放大电路处理,再控制LED灯和蜂鸣器产生视觉和听觉刺激。系统输出的正弦信号参数的平均误差分别为0.03%(频率)、1.10%(幅度)、0%(相位)。进一步,开展脑电采集实验。实验结果表明系统输出的视觉和听觉刺激能产生稳态诱发脑电。该系统在视听感知功能研究方面具有应用价值。The steady-state evoked EEG has frequency labeling characteristics,which is widely used in the research of brain perception and cognition.The interaction between the two types of perceptual functions can be explored by using bimodal stimulus.Therefore,a periodic sensory stimulus system integrating visual and auditory modes is designed.The system controls AD9959 to output two sinusoidal signals with STM32F103RC as the core.The output signal is processed by a seven-order low-pass filter circuit and a ten-fold amplification circuit,and then the LED light and buzzer are controlled to generate visual and auditory stimulus.The average errors of the sinusoidal signal parameters output by the system are 0.03%(frequency),1.10%(amplitude),and 0%(phase),respectively.Further,EEG acquisition experiments are carried out.The experimental results show that the visual and auditory stimulus output by the system can produce steady-state evoked EEG.The system has application value in the research of visual-auditory perception function.

关 键 词：双模态 感觉刺激 STM32F103RC AD9959 稳态诱发电位 

分 类 号：R318.6[医药卫生—生物医学工程]