Abstract
Aims
Gamma oscillations (≈25–100 Hz) are believed to play an essential role in cognition, and aberrant gamma oscillations occur in brain aging and neurodegeneration. This study examined age-related changes in visually evoked gamma oscillations at two different time points 5 years apart and tested the hypothesis that the power of gamma oscillations correlated to cognitive skills.
Methods
The cohort consists of elderly males belonging to the Metropolit 1953 Danish Male Birth Cohort (first visit, N=124; second visit, N=88) over a 5-year period from 63 to 68 years of age. Cognitive functions were assessed using a neuropsychological test battery measuring global cognition, intelligence, memory, and processing speed. The power of steady-state visual evoked potentials (SSVEP) was measured at 8 Hz (alpha) and 36 Hz (gamma) frequencies using EEG scalp electrodes.
Results
Over the 5-year period cognitive performance remained relatively stable while the power of visually evoked gamma oscillations shifted from posterior to anterior brain regions with increasing age. A higher-than-average cognitive score was correlated with higher gamma power in parieto-occipital areas and lower in frontocentral areas, i.e., preserved distribution of the evoked activity.
Conclusions
Our data reveal that the distribution of visually evoked gamma activity becomes distributed with age. Preserved posterior-occipital gamma power in participants with a high level of cognitive performance is consistent with a close association between the ability to produce gamma oscillations and cognition. The data may contribute to our understanding of the mechanisms that link evoked gamma activity and cognition in the aging brain.
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Acknowledgements
We want to thank Sine Kongsbak Arvedsen and Natalia Christina Brandstrup for their work with coordinating the project and the extensive data collection. We also thank Keng Wah Niels Pang and Miki Nikolic for all technical assistance and their valuable input on processing of the EEG data.
Funding
The study was supported by a Nordea Foundation Grant to the Center for Healthy Ageing at the University of Copenhagen. The Copenhagen Ageing and Midlife Biobank is supported by grants from the Velux Foundation (VELUX26145 and 31539).
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The study was approved by the Capital Region of Denmark’s Committee on Health Research Ethics (H-1–2014032). All participants provided written consent regarding their participation and publication of the current data.
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Bakhtiari, A., Petersen, J., Urdanibia-Centelles, O. et al. Power and distribution of evoked gamma oscillations in brain aging and cognitive performance. GeroScience 45, 1523–1538 (2023). https://doi.org/10.1007/s11357-023-00749-x
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DOI: https://doi.org/10.1007/s11357-023-00749-x