Symbolic entropy of the amplitude rather than the instantaneous frequency of EEG varies in dementia

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Title:	Symbolic entropy of the amplitude rather than the instantaneous frequency of EEG varies in dementia
Authors:	林澂;Lin, Pei-Feng;Tsao, Jenho;Lo, Men-Tzung;Lin, Chen;Chang, Yi-Chung
Contributors:	生醫理工學院生醫科學與工程學系
Keywords:	Alzheimer’s disease;Amplitudes;Dynamics;EEG amplitude;Electric potential;Electroencephalography;Entropy;Intervals;photic stimulation;Photics;Stimulation;symbolic dynamics;vascular dementia
Date:	2015-01-01
Issue Date:	2026-04-23 11:22:04 (UTC+8)
Publisher:	MDPI Multidisciplinary Digital Publishing Institute;Basel: MDPI AG
Abstract:	摘要： The dynamics of human electroencephalography (EEG) have been proved to be related to cognitive activities. This study separately assessed the two EEG components, amplitude and rhythm, aiming to capture their individual contributions to cognitive functions. We extracted the local peaks of EEGs under rest or photic stimulation and calculated the symbolic dynamics of their voltages (amplitude) and interpeak intervals (instantaneous frequency), individually. The sample consisted of 89 geriatric outpatients in three patient groups: 38 fresh cases of vascular dementia (VD), 22 fresh cases of Alzheimer’s disease (AD) and 29 controls. Both sample entropy and number of forbidden words revealed significantly less regular symbolic dynamics in the whole EEG tracings of the VD than the AD and control groups. We found consistent results between groups with the symbolic dynamics in the local-peak voltage sequence rather than the interpeak interval sequence. Photic stimulation amplified the differences between groups. These results suggest that the EEG dynamics which relates to either cognitive functions or the underlying pathologies of dementia are embedded within the dynamics of the amount of but not the interval between each synchronized firing of adjacent cerebral neurons. 出版者： Basel: MDPI AG 出版日期： 2015 出處： Entropy (Basel, Switzerland), 2015, Vol.17 (2), p.560-579 資源來源： Directory of Open Access Journals 版權： Copyright MDPI AG 2015 識別號： ISSN: 1099-4300 識別號： EISSN: 1099-4300 識別號： DOI: 10.3390/e17020560
Appears in Collections:	[Department of Biomedical Sciences and Engineering ] journal & Dissertation

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