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Our study sought to validate high-altitude hypoxia as a model for assessing brain activity disruptions akin to aging. We collected EEG data from 16 healthy volunteers during acute high-altitude hypoxia (at 4,000 masl) and at sea level, focusing on relative changes in power and aperiodic slope of the EEG spectrum due to hypoxia. Additionally, we examined functional connectivity using wPLI, and functional segregation and integration using graph theory tools. High altitude led to slower brain oscillations, that is, increased \u03b4 and reduced \u03b1 power, and flattened the 1\/f aperiodic slope, indicating higher electrophysiological noise, akin to healthy aging. Notably, functional integration strengthened in the \u03b8 band, exhibiting unique topographical patterns at the subnetwork level, including increased frontocentral and reduced occipitoparietal integration. Moreover, we discovered significant correlations between subjects\u2019 age, 1\/f slope, \u03b8 band integration, and observed robust effects of hypoxia after adjusting for age. Our findings shed light on how reduced oxygen levels at high altitudes influence brain activity patterns resembling those in neurodegenerative disorders and aging, making high-altitude hypoxia a promising model for comprehending the brain in health and disease.<\/jats:p>","DOI":"10.1162\/netn_a_00352","type":"journal-article","created":{"date-parts":[[2023,12,4]],"date-time":"2023-12-04T18:41:55Z","timestamp":1701715315000},"page":"275-292","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":31,"title":["Elevating understanding: Linking high-altitude hypoxia to brain aging through EEG functional connectivity and spectral analyses"],"prefix":"10.1162","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9428-2410","authenticated-orcid":true,"given":"Carlos","family":"Coronel-Oliveros","sequence":"first","affiliation":[{"name":"Latin American Brain Health Institute (BrainLat), Universidad Adolfo 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