Review Article
Role of EEG as Biomarker in the Early Detection and Classification of Dementia
Table 1
Findings of effective linear and nonlinear methods for detecting dementia [
55,
107,
121,
122,
131].
| ā | Methods | Finding |
| Linear techniques | Spectral analysis | Median frequency (MF) | Dementia is associated with a slowing of brain frequencies | Spectral entropy (SpecEn) | Dementia causes a change in the frequency content of the brain signals | Zero crossing interval (ZCI) | ZCI increased in slow activity associated with dementia |
| Nonlinear techniques | Fractal dimension (FD) | FD of the EEG is lower for dementia patients than normal subjects | Lempel-Ziv-Welch (LZW) | Lower LZW of dementia patients than normal subjects due to reduce complexity | Tsallis entropy (TsEn) | Lower TsEn in AD group than the normal |
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