摘要
稳态视觉诱发电位由于其高信噪比和易提取的特征成为是脑机接口系统中重要输入信号。了解注意对SSVEP的调节作用,是建立基于SSVEP脑机接口系统的基础。本研究中采用了经典的SSVEP实验范式,呈现两列字母序列,同时在字母序列的位置上呈现频率不同的闪烁背景以产生SSVEP,并通过设置了集中注意和分散注意两类实验情景,探讨注意资源的分配对SSVEP的影响。研究得到以下结果:(1)稳态视觉诱发电位的振幅与注意资源的分配存在对应关系,注意资源分配得越多,稳态视觉诱发电位的振幅越大。(2)利用集中注意、分散注意和非注意状态的差异,可以增加基于稳态视觉诱发电位的脑机接口的视觉信号输入。本研究结果不仅有助于进一步了解注意的神经机制,而且可为建立基于SSVEP脑机接口提供科学依据。
Steady-state visual evoked potential( SSVEP) has been frequently used by Brain-Computer Interface( BCI) system due to high signal-noise ratio and easy analysis. The BCI is based on the modulation effect of attention on the SSVEP. Studies on the relation between attention and the SSVEP also lead to further understanding the neural mechanism of attention. In the present study,the classical SSVEP paradigm was used. Two sequences of letters were rapidly presented,each superimposed upon a small square background which was flickered at a rate of 9. 44 Hz or12. 14 Hz. The SSVEP was elicited by the flickers.Focus attention and divided attention were manipulated to investigate the relation between attentional distribution and SSVEP. Findings are as follows:( 1)the amplitude of the SSVEP was related to the deployment of the attentional resource,specifically,the more attentional resource deployed,the higher amplitude of the SSVEP was.( 2) The input of the SSVEP-based BCI could be increased by manipulating different attention situations( i. e. focused attention,divided attention vs. unattended attention).
出处
《应用心理学》
CSSCI
2015年第4期362-368,共7页
Chinese Journal of Applied Psychology
基金
浙江省教育厅科研项目资助(Y201328830)
国家自然科学基金项目(31371039)
关键词
稳态视觉诱发电位
注意
脑机接口
steady-state visual evoked potential
attention
brain-computer interface