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具体与抽象图形对 N200 和 P300 电位的影响研究

李梦凡 杨光

李梦凡, 杨光. 具体与抽象图形对 N200 和 P300 电位的影响研究[J]. 仁和测试, 2020, 37(3): 427-433, 441. doi: 10.7507/1001-5515.201903042
引用本文: 李梦凡, 杨光. 具体与抽象图形对 N200 和 P300 电位的影响研究[J]. 仁和测试, 2020, 37(3): 427-433, 441. doi: 10.7507/1001-5515.201903042
Mengfan LI, Guang YANG. Influence of the concrete and abstract graphs on N200 and P300 potentials[J]. Rhhz Test, 2020, 37(3): 427-433, 441. doi: 10.7507/1001-5515.201903042
Citation: Mengfan LI, Guang YANG. Influence of the concrete and abstract graphs on N200 and P300 potentials[J]. Rhhz Test, 2020, 37(3): 427-433, 441. doi: 10.7507/1001-5515.201903042

具体与抽象图形对 N200 和 P300 电位的影响研究

doi: 10.7507/1001-5515.201903042
基金项目: 国家自然科学青年基金(61806070);河北省自然科学青年基金(F2018202088)
详细信息
    通讯作者:

    李梦凡,Email:mfli@hebut.edu.cn

Influence of the concrete and abstract graphs on N200 and P300 potentials

Funds: The National Natural Science Foundation of China; The Natural Science Foundation of Hebei Province
More Information
  • 摘要: 增大事件相关电位的幅值是提高 P300 等经典事件相关电位范式下的脑-机接口系统辨识意图准确率的重要方法之一,此类脑-机接口系统常以符号或者被控对象作为视觉刺激,但是何种视觉刺激能够获得更明显的事件相关电位仍然未知。本文设计方形、箭头和机器人附加箭头这三种视觉刺激,分析图片的具体程度对 N200 和 P300 电位的影响,并采用支持向量机辨识该诱发电位来对比不同刺激下的脑-机接口性能。结果显示,与方形相比,机器人附加箭头和箭头都在额叶诱发出幅值更大的 N200 电位(P = 1.6 × 10−3P = 4.2 × 10−2)和潜伏期更长的 P300 电位(P = 2.2 × 10−3P = 1.9 × 10−2)。机器人附加箭头将方形和箭头的 N200 电位幅值数值分别从 3.12 μV 和 5.19 μV 提升至 7.21 μV(P = 1.6 × 10−3P = 8.9 × 10−2),单次准确率从 59.95% 和 61.67% 提升至 74.45%(P = 2.1 × 10−2P = 1.6 × 10−2),单次信息传输率从 35.00 bits/min 和 35.98 bits/min 提升至 56.71 bits/min(P = 2.6 × 10−2P = 1.6 × 10−2)。本研究表明图形的具体性会影响 N200 电位和 P300 电位,箭头虽然能够表征图片的含义并诱发电位,但是机器人附加箭头所包含的信息与人的经验相关度更大,有助于获得更高的电位幅值。该研究可为脑-机接口的视觉刺激界面优化设计提供新的思路。
  • 图  1  视觉诱发界面

    Figure  1.  Visual interface

    图  2  三种刺激下的波形图

    Figure  2.  The ERP under three conditions

    图  3  三种刺激下的脑地形图

    Figure  3.  The topographies of ERPs under three conditions

    图  4  三种条件下的准确率与信息传输率

    Figure  4.  Accuracies and ITRs under three conditions

    表  1  三种刺激条件下 ERP 的幅值和潜伏期

    Table  1.   The amplitude and latency of ERP under three stimulus conditions

    刺激条件 Fz Oz
    N200 P300 N200 P300
    幅值/μV 潜伏期/ms 幅值/μV 潜伏期/ms 幅值/μV 潜伏期/ms 幅值/μV 潜伏期/ms
    方形 −3.21 281 2.45 402 −1.95 154 2.44 271
    箭头 −5.19 266 4.78 428 −2.66 181 3.45 283
    机器人附加箭头 −7.21 259 5.12 443 −2.76 146 3.69 241
    下载: 导出CSV

    表  2  三种刺激条件下准确率和信息传输率

    Table  2.   Accuracies and information transfer rates under three stimulus conditions

    刺激条件 准确率 信息传输率
    一次 三次 一次/(bit·min−1 三次/(bit·min−1
    方形 59.95% 85.15% 35.00 26.60
    箭头 61.67% 90.51% 35.98 30.53
    机器人附加箭头 74.45% 96.85% 56.71 35.76
    下载: 导出CSV
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  • 收稿日期:  2019-03-31
  • 修回日期:  2020-04-11
  • 刊出日期:  2020-03-17

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