北京生物医学工程2018，Vol.37Issue(3)：259-264,6.DOI:10.3969/j.issn.1002-3208.2018.03.007
稳态视觉诱发电位频率响应特性研究
Research on frequency response characteristics of steady-state visual evoked potential
摘要
Abstract
Objective Steady-state visual evoked potential ( SSVEP ) is the response of brain elicited by periodic visual stimulation, and is widely used in electroencephalography ( EEG ) based brain-computer interface ( BCI) . SSVEP frequency-response functions are usually obtained by using a light emitting diode ( LED) as a visual stimulator. Recently, the computer monitor is widely used for producing flickering stimuli. However, there are few existing studies that have attempted to investigate computer monitor-based SSVEP frequency-response functions. Therefore, this study investigated computer monitor-based SSVEP frequency-response characteristic. Methods We used the sampled sinusoidal encoded method to realize 42 stimulation frequencies ranging from 4 Hz to 45 Hz on a conventional LCD screen. We collected an EEG dataset from 10 healthy subjects and investigated the relationship between SSVEP amplitude/signal-to-noise ratio ( SNR ) and stimulation frequencies. Results Strong SSVEPs were observed over occipital area. The SSVEP amplitude of the fundamental frequency exhibited strong peak at 10 Hz and weaker secondary maximum at 20 Hz. The SSVEP amplitude of the second harmonic was maximal for the stimulation frequency of 6 Hz and smaller for higher stimulation frequencies. The SSVEP SNR of the fundamental frequency in the low-and medium-frequency bands was comparable. Conclusions These results could provide a basis for frequency selection of computer screen-based SSVEP-BCIs.关键词
稳态视觉诱发电位/脑电/脑-机接口/幅值/信噪比Key words
steady-state visual evoked potential/electroencephalography/brain-computer interface/amplitude/signal-to-noise ratio分类
医药卫生引用本文复制引用
陈小刚,徐圣普..稳态视觉诱发电位频率响应特性研究[J].北京生物医学工程,2018,37(3):259-264,6.基金项目
国家自然科学基金(61603416)、中国科协青年人才托举工程(YESS20150049)、协和青年基金(3332016101)、中国医学科学院医学与健康科技创新工程项目(2016-I2M-3-023)资助 （61603416）
