[1]邓轩,覃玉荣,马永霞.不同认知深度下大脑α波同步变化规律研究[J].中国医学物理学杂志,2021,38(6):737-742.[doi:DOI:10.3969/j.issn.1005-202X.2021.06.015]
　DENG Xuan,QIN Yurong,MA Yongxia.Change rule of brain alpha wave synchronization under different depths of cognitive processing[J].Chinese Journal of Medical Physics,2021,38(6):737-742.[doi:DOI:10.3969/j.issn.1005-202X.2021.06.015]
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不同认知深度下大脑α波同步变化规律研究()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
38卷
期数:
2021年第6期
页码:
737-742
栏目:
医学信号处理与医学仪器
出版日期:
2021-06-29

文章信息/Info

Title:
Change rule of brain alpha wave synchronization under different depths of cognitive processing
文章编号:
1005-202X（2021）06-0737-06
作者:
邓轩; 覃玉荣; 马永霞
广西大学计算机与电子信息学院， 广西 南宁 530004
Author(s):
DENG Xuan;  QIN Yurong;  MA Yongxia
School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China
关键词:
认知深度; 稳态视觉诱发电位; α波同步; 归一化香农熵
Keywords:
Keywords: depth of cognitive processing steady-state visual evoked potential alpha wave synchronization normalized Shannon entropy
分类号:
R318；R338.8
DOI:
DOI:10.3969/j.issn.1005-202X.2021.06.015
文献标志码:
A
摘要:
以能体现不同认知深度的视觉图形为刺激源，以归一化香农熵作为稳态视觉诱发电位（SSVEP）的α波与刺激信号相位同步的有效评测指标，受试者识别视觉图像的正确率为认知精度，刺激频率为7~15 Hz，刺激强度为强、中、弱（分别对应屏幕最大亮度的100%、50%、0%），实验研究认知深度与SSVEP的α波的相位同步程度之间的变化关系。结果表明：（a）在本文研究范围内，无论刺激强度为强、中、弱，深度认知对应的α波同步程度最大，其次是中度认知的，浅层次认知对应的同步程度最小；（b）刺激强度一定时，3种不同认知深度下的α波同步程度在大脑自发α波频率处（IAF, 约为10 Hz) 最大，随着刺激频率与IAF差值绝对值的增加，同步程度逐渐下降，呈现非线性同步理论中阿诺德舌头变化规律；（c）在中、低刺激强度下，当刺激强度一定时，认知精度随刺激频率和IAF差值绝对值的增加而呈现阿诺德舌头变化规律（中心频率为IAF），此外，在中等刺激强度，13 Hz处也呈现较高的认知精度。不过，当刺激强度超过一定阈值时，认知精度出现明显下降趋势，提示过高的视觉强度将影响认知精度大小。本结果为研究认知活动的潜在作用机制和大脑认知功能障碍的诊断与治疗提供了新思路。
Abstract:
Abstract: Visual graphics that can reflect different depths of cognitive processing are used as the stimuli, and normalized Shannon entropy is used as an index for effectively evaluating the phase synchronization of the alpha wave of steady-state visual evoked potentials (SSVEP) and the simulation signals. The correct rate of visual image recognition is taken as the cognitive accuracy. Based on the stimulation frequency of 7-15 Hz and different stimulation intensities (strong, medium and weak, which corresponds to 100%, 50% and 0% of the maximum brightness of the screen, respectively), the relationship between the depth of cognitive processing and SSVEP alpha wave phase synchronization is studied. Within the scope of this study, whether the stimulation intensity is strong, medium or weak, the degree of alpha wave synchronization corresponding to deep cognition is the highest, followed by that corresponding to moderate cognition, and the degree of alpha wave synchronization corresponding to shallow cognition is the smallest. When the stimulation intensity is constant, the degree of alpha wave synchronization at 3 different depths of cognitive processing reaches the highest at the brain spontaneous alpha wave frequency (Individual Alpha Frequency, IAF, around 10 Hz). As the absolute value of the difference between stimulation frequency and IAF increases, the degree of synchronization gradually decreases, showing the law of Arnolds tongue change in the nonlinear synchronization theory. Under the low and medium stimulation intensities, when the stimulation intensity is constant, the cognitive accuracy shows the law of Arnolds tongue changing with the increasing of the absolute value of the difference between stimulation frequency and IAF (the center frequency is IAF). In addition, at medium stimulation intensity, a higher cognitive accuracy is also occurred at 13 Hz. However, when the stimulation intensity exceeded a certain threshold, there is a significant downward trend in cognitive accuracy, suggesting that too high visual intensity will affect the cognitive accuracy. The results of this study provide new ideas for studying the potential mechanism of cognitive activity and the diagnosis and treatment of brain cognitive dysfunction.

相似文献/References:

[1]李东阁. 不同灰度值刺激产生的稳态视觉诱发电位比较[J].中国医学物理学杂志,2019,36(3):340.[doi:DOI:10.3969/j.issn.1005-202X.2019.03.019]
　LI Dongge. Comparison of steady-state visual evoked potential produced by stimulations with different grey values[J].Chinese Journal of Medical Physics,2019,36(6):340.[doi:DOI:10.3969/j.issn.1005-202X.2019.03.019]

备注/Memo

备注/Memo:
【收稿日期】2020-11-16 【基金项目】国家自然科学基金（81560523）；广西自然科学基金（2016GXNSFAA380068） 【作者简介】邓轩，硕士研究生，研究方向：生物医学信号处理，E-mail: 907247868@qq.com 【通信作者】覃玉荣，工学博士，教授，研究方向：生物医学信号处理、无线通信等，E-mail: qyr111@163.com
更新日期/Last Update: 2021-06-29