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Healthy aging and cognitive impairment alter EEG functional connectivity in distinct frequency bands
  • Wupadrasta Kumar,
  • Supratim Ray
Wupadrasta Kumar
Indian Institute of Science Centre for Neuroscience
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Supratim Ray
Indian Institute of Science Centre for Neuroscience

Corresponding Author:[email protected]

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Functional connectivity (FC) indicates the interdependencies between brain signals recorded from spatially distinct locations in different frequency bands, which is modulated by cognitive tasks and is known to change with aging and cognitive disorders. Recently, the power of narrow-band gamma oscillations induced by visual gratings has been shown to reduce with both healthy aging and in subjects with mild cognitive impairment (MCI). However, the impact of aging/MCI on stimulus-induced gamma FC has not been well studied. We recorded electroencephalogram (EEG) from a large cohort (N=229) of elderly subjects (>49 years) while they viewed large cartesian gratings to induce gamma oscillations and studied changes in alpha and gamma FC with healthy aging (N=218) and MCI (N=11). Surprisingly, we found that aging and disease changed power and FC in different ways. With healthy aging, alpha power did not change but FC decreased significantly. MCI reduced gamma but not alpha FC significantly compared with age and gender matched controls, even when power was matched between the two groups. Overall, our results show distinct effects of aging and disease on EEG power and FC, suggesting different mechanisms underlying aging and cognitive disorders.
28 Jun 2023Submitted to European Journal of Neuroscience
29 Jun 2023Assigned to Editor
29 Jun 2023Review(s) Completed, Editorial Evaluation Pending
29 Jun 2023Submission Checks Completed
29 Jun 2023Reviewer(s) Assigned
14 Jul 2023Editorial Decision: Revise Major
20 Jul 20231st Revision Received
21 Jul 2023Review(s) Completed, Editorial Evaluation Pending
21 Jul 2023Submission Checks Completed
21 Jul 2023Assigned to Editor
24 Jul 2023Editorial Decision: Accept