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IJSTR >> Volume 9 - Issue 11, November 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Analysis Of Respiratory Signal For Anxiety Disorder Identification

[Full Text]



H. Haritha, C. Santhosh Kumar, A. Anand Kumar



Anxiety Disorder Identification, Machine Learning, RRV, Respiratory Signal, SVM.



Anxiety disorder identification (ADI) is becoming increasingly important in addressing mental health across the population. Traditionally, ECG has been found to be effective as a means to estimate stress and anxiety, and the effect of respiratory signal has been considered as undesirable. In this work, we study how respiratory signal can be effectively used for ADI. The data for this study was collected from normal population, subjects with anxiety disorders and regular meditators, at the Department of Neurology and the Department of Psychiatry, Amrita Institute of Medical Sciences (AIMS), Kerala, over a period of 1.5 years. We used respiratory rate variability (RRV) features as input to support vector machine (SVM) classifier for our baseline ADI system. We noticed that the baseline ADI gave very low classification performance, 63.88%, 83.43% and 69.23% absolute respectively, for sensitivity, specificity and accuracy. We observed large within class person specific variations (PSV) in the RRV features among the controls and the effect of these variations in the RRV features is a nuisance factor affecting the performance of the ADI adversely. To minimize the effect of PSV, we explored several techniques such as covariance normalization (CVN) and Fisher vector encoding (FVE), and on combining CVN and FVE (RFE-CVN-FVE-SVM-ADI), we obtained a sensitivity of 91.66% absolute, specificity of 95.23% absolute and accuracy of 92.30% absolute, which is an improvement of 27.78% absolute sensitivity, 11.80% absolute specificity and 23.07% absolute accuracy, over the baseline ADI. The optimum sets of features were selected using recursive feature elimination (RFE) algorithm. Respiratory signal can be effectively used in ADI. The study scientifically establishes the role of meditation and yoga in reducing anxiety and stress disorders, thus helping in the overall wellness of patients with psychiatric disorders, in their speedy recovery.



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