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Alterations of resting-state Gamma frequency characteristics in aging and Alzheimer’s disease

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Abstract

Alzheimer’s disease (AD) is an important brain disease associated with aging. It involves various functional and structural changes which alter the EEG characteristics. Although numerous studies have found changes in delta, theta, alpha, and beta power, fewer studies have looked at the changes in the resting state EEG gamma activity characteristics in AD. This study aimed to investigate the alterations in the frequency and power values of AD patients’ resting-state EEG gamma oscillations compared with healthy elderly and young subjects. We performed Fast Fourier Transform (FFT) on the resting state EEG data from 179 participants, including 59 early stage AD patients, 60 healthy elderly, and 60 healthy young subjects. We averaged FFT performed epochs to investigate the power values in the gamma frequency range (28–48 Hz). We then sorted the peaks of power values in the gamma frequency range, and the average of the identified highest three values was named as the gamma dominant peak frequency. The gamma dominant peak frequency of AD patients (Meyes−opened = 33.4 Hz, Meyes−closed = 32.7 Hz) was lower than healthy elderly (Meyes−opened = 35.5 Hz, Meyes−closed = 35.0 Hz) and healthy young subjects (Meyes−opened = 37.2 Hz, Meyes−closed = 37.0 Hz). These results could be related to AD progression and therefore critical for the recent findings regarding the 40 Hz gamma entrainment because it seems they entrain the gamma frequency of AD towards that of healthy young.

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Data Availability

The data supporting the findings of the article is available in the Resting-state EEG Gamma in Alzheimer at https://osf.io/5sfa4/ (Güntekin et al. 2022).

Abbreviations

AD:

Alzheimer’s disease.

CDR:

clinical dementia rating.

EC:

eyes-closed.

EO:

eyes-opened.

EOG:

electro-oculogram.

EEG:

electroencephalogram.

FFT:

Fast Fourier Transform.

HE:

Healthy elderly.

HY:

Healthy young.

MCI:

Mild Cognitive Impairment.

MMSE:

mini-mental state examination.

MRI:

magnetic resonance imaging.

PV cells:

parvalbumin positive inhibitory interneurons.

rsEEG:

resting-state electroencephalography.

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Acknowledgements

Conceptualization: Bahar Güntekin, Görsev Yener, Lütfü Hanoğlu; Methodology: Bahar Güntekin, Görsev Yener, Lütfü Hanoğlu; Investigation: Bahar Güntekin, Furkan Erdal, Burcu Bölükbaş, Görsev Yener, Lütfü Hanoğlu, Rümeysa Duygun; Supervision: Bahar Güntekin, Görsev Yener, Lütfü Hanoğlu; Writing - original draft preparation: Bahar Güntekin, Furkan Erdal, Burcu Bölükbaş, Görsev Yener, Lütfü Hanoğlu, Rümeysa Duygun; Writing - review & editing: Bahar Güntekin, Furkan Erdal, Görsev Yener, Lütfü Hanoğlu, Rümeysa Duygun; Planning: Bahar Güntekin, Görsev Yener, Lütfü Hanoğlu; Data collection - EEG recording: Bahar Güntekin, Görsev Yener, Lütfü Hanoğlu; Project administration: Bahar Güntekin, Görsev Yener, Lütfü Hanoğlu; Data curation: Burcu Bölükbaş, Rümeysa Duygun; Formal Analysis - Software: Burcu Bölükbaş, Rümeysa Duygun; Visualization: Furkan Erdal, Burcu Bölükbaş.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Furkan Erdal was supported by TÜBİTAK (Scientific and Technological Research Council of Turkey)-2210 National Scholarship Program for MSc Students grant.

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Correspondence to Bahar Güntekin.

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For all participants included in this retrospective analysis, an informed consent form was obtained at the time of data collection. Ethical approval for this study was obtained from the ethics committee of Istanbul Medipol University (no: E-10840098-772.02-5002).

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Güntekin, B., Erdal, F., Bölükbaş, B. et al. Alterations of resting-state Gamma frequency characteristics in aging and Alzheimer’s disease. Cogn Neurodyn 17, 829–844 (2023). https://doi.org/10.1007/s11571-022-09873-4

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