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Higher-order spectral analysis of spontaneous speech signals in Alzheimer’s disease

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Abstract

An early and accurate diagnosis of Alzheimer’s disease (AD) has been progressively attracting more attention in recent years. One of the main problems of AD is the loss of language skills. This paper presents a computational framework for classifying AD patients compared to healthy control subjects using information from spontaneous speech signals. Spontaneous speech data are obtained from 30 AD patients and 30 healthy controls. Because of the nonlinear and dynamic nature of speech signals, higher order spectral features (specifically bispectrum) were used for analysis. Four classifiers (k-Nearest Neighbor, Support Vector Machine, Naïve Bayes and Decision tree) were used to classify subjects into three different levels of AD and healthy group based on their performance in terms of the HOS-based features. Ten-fold cross-validation method was used to test the reliability of the classifier results. The results showed that the proposed method had a good potential in AD diagnosis. The proposed method was also able to diagnose the earliest stage of AD with high accuracy. The method has the great advantage of being non-invasive, cost-effective, and associated with no side effects. Therefore, the proposed method can be a spontaneous speech directed test for pre-clinical evaluation of AD diagnosis.

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Authors and Affiliations

  1. Department of Biomedical Engineering, Hakim Sabzevari University, Sabzevar, Iran

    Mahda Nasrolahzadeh, Zeynab Mohammadpoory & Javad Haddadnia

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  1. Mahda Nasrolahzadeh
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  2. Zeynab Mohammadpoory
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Correspondence to Mahda Nasrolahzadeh.

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Nasrolahzadeh, M., Mohammadpoory, Z. & Haddadnia, J. Higher-order spectral analysis of spontaneous speech signals in Alzheimer’s disease. Cogn Neurodyn 12, 583–596 (2018). https://doi.org/10.1007/s11571-018-9499-8

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