摘要
为了帮助解决脑机接口中人脑信号与高级认知活动之间的对接问题,建立了同时模拟高级认知过程与人脑信号模式的认知模型。采用的方法是ACT-R认知仿真实验结合fMRI脑影像实验。以简化四方趣题为实验范式,设计有锚和无锚两类不同复杂度任务。从ACT-R认知仿真实验分析出高级认知过程,从fMRI实验结果分析出感兴趣脑区BOLD信号模式。通过对两实验结果进一步分析得出,不同的高级认知活动过程对脑功能区BOLD信号模式存在多处影响,包括启动值和BOLD的峰值位置、平均变化量、上升变化量以及下降变化量。本研究获得了高级认知过程对脑区信号模式影响结果,将对脑机接口技术的发展提供认知依据。
To disclose the relationship of advanced cognition and activation pattern of brain regions in advanced cognitive tasks（ACTs） for brain-computer interface（BCI）,established a cognitive model simulated advanced information processing and activation pattern of brain regions.Adopted the method of ACT-R（adaptive control of thought-rational） cognitive system simulation combined fMRI（functional magnetic resonance imaging）experiment.Based on simplified 4×4 sudoku paradigm,designed two kinds of tasks,including anchor tasks and none-anchor tasks.Established an ACT-R cognitive system to simulate advanced mental processing and BOLD（blood oxygen level dependent） response.Conducted an fMRI experiment to get differences of BOLD response pattern.Combined two experiment results,concluded the effects of advanced cognition to BOLD response patterns,including startup effect,BOLD peak value,average change of BOLD and its ascending speed and descending speed.These results may support the cognitive based evidence to the development of human-computer interface.
出处
《计算机应用研究》
CSCD
北大核心
2011年第9期3279-3283,3304,共6页
Application Research of Computers
基金
国家自然科学基金资助项目(60875075)
