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However, the stability of these fingerprints is affected by aging and disease. As such, the stability of brain fingerprints may be a useful metric when studying normal and pathological neurodevelopment. Before examining clinically relevant deviations, the individual stability and variation of neuroimaging features across brain maturation in normally developing children need to be addressed with real clinical data. Here we applied Bayesian reduced-rank regression (BRRR) to extract low-dimensional representations of electroencephalography (EEG) power spectra measured during different non-REM sleep stages (N1 and N2) from 782 normally developing children aged between 6 weeks to 19 years. The representations learned within specific sleep stages successfully separated between subjects and generalized across sleep stages. Fingerprint stability increased with the age of the subjects. Compared to correlation-based fingerprinting methods, the BRRR model performed better, especially in fingerprinting across sleep stages, highlighting the usefulness of dimensionality reduction when the noise and signal of interest are correlated. While further studies are needed to address the possible non-linear maturation effects over developmental periods, our results demonstrate the existence of stable within-session neurofunctional fingerprints in pediatric populations.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1013931","type":"journal-article","created":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T18:46:46Z","timestamp":1769798806000},"page":"e1013931","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Capturing individual variation in children\u2019s electroencephalograms during nREM sleep"],"prefix":"10.1371","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-4812-3749","authenticated-orcid":true,"given":"Verna","family":"Heikkinen","sequence":"first","affiliation":[]},{"given":"Susanne","family":"Merz","sequence":"additional","affiliation":[]},{"given":"Riitta","family":"Salmelin","sequence":"additional","affiliation":[]},{"given":"Sampsa","family":"Vanhatalo","sequence":"additional","affiliation":[]},{"given":"Leena","family":"Lauronen","sequence":"additional","affiliation":[]},{"given":"Mia","family":"Liljestr\u00f6m","sequence":"additional","affiliation":[]},{"given":"Hanna","family":"Renvall","sequence":"additional","affiliation":[]}],"member":"340","published-online":{"date-parts":[[2026,1,30]]},"reference":[{"issue":"9509","key":"pcbi.1013931.ref001","doi-asserted-by":"crossref","first-page":"499","DOI":"10.1016\/S0140-6736(06)68182-8","article-title":"Epilepsy in children","volume":"367","author":"R 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