Regularized Linear Discriminant Analysis of EEG Features in Dementia Patients

Abstract

The present study explores if EEG spectral parameters can discriminate between healthy elderly controls (HC), Alzheimer’s disease (AD) and vascular dementia (VaD) using. We considered EEG data recorded during normal clinical routine with 114 healthy controls (HC), 114 AD, and 114 VaD patients. The spectral features extracted from the EEG were the absolute delta power, decay from lower to higher frequencies, amplitude, center and dispersion of the alpha power and baseline power of the entire frequency spectrum. For discrimination, we submitted these EEG features to regularized linear discriminant analysis algorithm with a 10-fold cross-validation. To check the consistency of the results obtained by our classifiers, we applied bootstrap statistics. Four binary classifiers were used to discriminate HC from AD, HC from VaD, AD from VaD, and HC from dementia patients (AD or VaD). For each model, we measured the discrimination performance using the area under curve (AUC) and the accuracy of the cross-validation (cv-ACC). We applied this procedure using two different sets of predictors. The first set considered all the features extracted from the 22 channels. For the second set of features, we automatically rejected features poorly correlated with their labels. Fairly good results were obtained when discriminating HC from dementia patients with AD or VaD (AUC = 0.84). We also obtained AUC = 0.74 for discrimination of AD from HC, AUC = 0.77 for discrimination of VaD from HC, and finally AUC = 0.61 for discrimination of AD from VaD. Our models were able to separate HC from dementia patients, and also and to discriminate AD from VaD above chance. Our results suggest that these features may be relevant for the clinical assessment of patients with dementia.

A comparison of resting state EEG and structural MRI for classifying Alzheimer’s disease and mild cognitive impairment

“…Identifying EEG markers specific to AD or MCI may be helpful at early stages of the disease when symptoms overlap (Cassani et al, 2018). Some research has been carried out in this area to date with vascular dementia and frontotemporal dementia, however, results are limited (see Neto, Biessmann, Aurlien, Nordby, & Eichele, 2016;Nishida et al, 2011).…”

Compressive Regularized Discriminant Analysis of High-Dimensional Data with Applications to Microarray Studies

“…whereΣ has been defined in (4) andμ g are the sample mean vectors of the classes in (2). Fast formula to computeΣ −1 is given in (5). Next let us draw attention to SCRDA [1] which usesΣ = αS + (1 − α)I instead of estimator in (4).…”

“…Such approaches are commonly referred to as regularized LDA methods, which we refer shortly as RDA. See e.g., [1][2][3][4][5].…”

Brain Signal Classification using Genetic Algorithm for Right-Left Motion Pattern

“…• Linear Discriminant Analysis (LDA) LDA performs linear analysis has its representation (vectors base) from dimensionless EEG vector space high, depending on the statistical point of view. By projecting an EEG vector into its base vector, representation will be obtained the feature of the wave per unit time [14].…”