Cognitive state recognition using wavelet singular entropy and ARMA entropy with AFPA optimized GP classification

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• 作者：Zhengxiang Cai^a ; ^{jack.marbles@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Qi Wu^b ; ^{wuqi7812@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Dan Huang^a ; ^{haungdan@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Lu Ding^a ; ^{dinglu@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Biting Yu^a ; ^{virid@yu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Rob Law^c ; ^{rob.law@polyu.edu.hk" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Jiayang Huang^dAuthor Vitae ; Shan Fu^b ; ^{sfu@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Cognitive state ; Wavelet singular entropy ; Autoregressive-moving average ; Gaussian process ; Flight simulation
• 刊名：Neurocomputing
• 出版年：2016
• 出版时间：12 July 2016
• 年：2016
• 卷：197
• 期：Complete
• 页码：29-44
• 全文大小：4368 K

文摘

Cognitive state, which is the inner mental state of a person while interacting with an artificial system through man-machine interface, can be affected by various factors, such as fatigue, stress, mental workload, attention deficit, and executive function, among others, which can lead to errors, accidents, or even disasters. One practical solution to this problem is to monitor and recognize the cognitive state of subjects via physiological signals. In this study, a hybrid adaptive flower pollination algorithm-Gaussian process model is proposed to recognize the cognitive state of in-flight pilots. Instead of using the traditional conjugate gradient technique to find optimal hyperparameters, an improved flower pollination algorithm is proposed. The adaptive Lévy strategy is then used to increase the robustness of this algorithm, as well as to enhance the global optimization and generalization capability of the Gaussian process model. In addition to conventional features in the time-frequency domain, a novel set of features involving wavelet singular entropy and autoregressive-moving average entropy is proposed to improve classification accuracy. Experiments are performed through flight simulations in a full flight simulator with six degrees of freedom. Comparable experimental results validate the feasibility of the proposed method for recognizing cognitive state and provide a wide range of conclusions on the feature selection and feature patterns of cognitive state.