摘要
背景:阿尔茨海默氏病(AD)的早期诊断对于预防其发展为痴呆至关重要。轻度认知障碍(MCI)可以指示早期AD。在这项研究中,我们提出了一种功能近红外光谱(fNIRS)数据的通道级特征提取方法,以在执行认知任务(包括双向,Stroop和语义口语流利任务(SVFT))时诊断MCI。 方法:提出了一种新的基于通道的特征提取方法,如下所述:将感兴趣区域(ROI)通道定义为两组之间t值具有统计差异(p <0.05)的通道。对于每个ROI通道,提取特征(均值,斜率,偏度,峰度和氧合和脱氧血红蛋白的峰值)。使用线性判别分析(LDA)和支持向量机(SVM)对这两类(MCI,HC)提取的特征进行分类。最后,使用接收器工作特性的曲线下面积(AUC)验证分类器。此外,将建议的特征提取方法与常规方法进行了比较。 15名MCI患者和15名健康对照(HCs)参加了该研究。 结果:在二后卫和Stroop任务中,HCs在腹外侧前额叶皮层(VLPFC)中激活。但是,对于MCI,未激活VLPFC。相反,Ch. 30被激活。在SVFT任务中,两组均激活了PFC,但是HC的t值高于MCI。对于SVFT,使用建议的特征提取方法进行分类的准确度分别为80.77%(LDA)和83.33%(SVM),在三个任务中表现最高。对于Stroop任务,分别为79.49%(LDA)和73.08%(SVM);而对于后卫任务,则为73.08%(LDA)和69.23%(SVM)。 结论:使用fNIRS检测了腹侧前额叶皮层中MCI和HC组之间的认知差异。所提出的特征提取方法已显示出分类准确性的改进,请参见第3.3节。最重要的是,建议的方法包含每个认知任务的组区分信息。获得的结果成功地区分了MCI患者和HCs,这表明所提出的方法是提取fNIRS信号特征的有效工具。
关键词: 轻度认知障碍(MCI),功能近红外光谱(fNIRS),语义口语流利度任务(SVFT),特征选择,线性判别分析(LDA),阿尔茨海默氏病。
Current Alzheimer Research
Title:Diagnosis of Mild Cognitive Impairment Using Cognitive Tasks: A Functional Near-Infrared Spectroscopy Study
Volume: 17 Issue: 13
关键词: 轻度认知障碍(MCI),功能近红外光谱(fNIRS),语义口语流利度任务(SVFT),特征选择,线性判别分析(LDA),阿尔茨海默氏病。
摘要:
Background: Early diagnosis of Alzheimer’s disease (AD) is essential in preventing its progression to dementia. Mild cognitive impairment (MCI) can be indicative of early-stage AD. In this study, we propose a channel-wise feature extraction method of functional near-infrared spectroscopy (fNIRS) data to diagnose MCI when performing cognitive tasks, including two-back, Stroop, and semantic verbal fluency tasks (SVFT).
Methods: A new channel-wise feature extraction method is proposed as follows: A region-of-interest (ROI) channel is defined as such channel having a statistical difference (p < 0.05) in t-values between two groups. For each ROI channel, features (the mean, slope, skewness, kurtosis, and peak value of oxy- and deoxy-hemoglobin) are extracted. The extracted features for the two classes (MCI, HC) are classified using the linear discriminant analysis (LDA) and support vector machine (SVM). Finally, the classifiers are validated using the area under curve (AUC) of the receiver operating characteristics. Furthermore, the suggested feature extraction method is compared with the conventional approach. Fifteen MCI patients and fifteen healthy controls (HCs) participated in the study.
Results: In the two-back and Stroop tasks, HCs showed activation in the ventrolateral prefrontal cortex (VLPFC). However, in the case of MCI, the VLPFC was not activated. Instead, Ch. 30 was activated. In the SVFT task, the PFC was activated in both groups, but the t-values of HCs were higher than those of MCI. For the SVFT, the classification accuracies using the proposed feature extraction method were 80.77% (LDA) and 83.33% (SVM), showing the highest among the three tasks; for the Stroop task, 79.49% (LDA) and 73.08% (SVM); and for the two-back task, 73.08% (LDA) and 69.23% (SVM).
Conclusion: The cognitive disparities between the MCI and HC groups were detected in the ventrolateral prefrontal cortex using fNIRS. The proposed feature extraction method has shown an improvement in the classification accuracies, see Subsection 3.3. Most of all, the suggested method contains a groupdistinction information per cognitive task. The obtained results successfully discriminated MCI patients from HCs, which reflects that the proposed method is an efficient tool to extract features in fNIRS signals.
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Cite this article as:
Diagnosis of Mild Cognitive Impairment Using Cognitive Tasks: A Functional Near-Infrared Spectroscopy Study, Current Alzheimer Research 2020; 17 (13) . https://dx.doi.org/10.2174/1567205018666210212154941
DOI https://dx.doi.org/10.2174/1567205018666210212154941 |
Print ISSN 1567-2050 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5828 |
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