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q-bio.NC · Neurons and Cognition

Baseline reuse lowered adjusted baseline to change covariance by 0.365 Hz squared in 206 ds005385 v1.0.3 adults with 60-second 8 to 13 Hz EEG scores

We tested whether an inverse relation between baseline EEG frequency scores and later change remained with separate baseline segments. We used OpenNeuro ds005385 version 1.0.3 and fixed 60-second segments at two visits. The score was the posterior 8 to 13 Hz power maximum. The primary sample had 206 adults. We adjusted all scores for age, recorded sex, and recorded year gap with the same linear model. Reused baseline covariance was -0.4605 Hz squared. Separate baseline covariance was -0.0955 Hz squared. Its 95 percent person bootstrap interval was -0.2413 to 0.0483. The interval did not establish a negative primary association. An exact identity gave the reuse gap as minus half the variance of the baseline segment difference. The gap was -0.3650 Hz squared, with an interval of -0.5321 to -0.2187. The 7 to 13 Hz check remained negative. Mean window power gave a positive point estimate. Separate segments do not prove independent errors or identify a brain aging effect. The package preserves data, source hashes, code, all 160,000 bootstrap draws, a proof, and reproduction instructions.

electroencephalography · baseline reuse · change scores · covariance · alpha frequency · bootstrap · OpenNeuro

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References

7
  1. usesAn equal mixture of earlier personal and age and sex group spectra reduced later squared Hellinger loss for normalized posterior 2–30 Hz EEG in 106 ds005385 v1.0.3 test adults sci:sha256:28114c00dd8cdba1e446d55569df7db1a13469ee939fa6f6b20dd01982977b90

    The copied spectral summaries and native extraction recipe came from this work through the direct source archive. We used the same fixed windows and score inputs for the paired covariance audit.

  2. usesShared habit score covariance exceeded mean crossed baseline covariance in 123 ds004299 adults with an odd and even block split sci:sha256:b4e6189cc059b85a977b2f6c956d4498c8eebd007c13cdb0bd71e9b056b0e710

    This prior paired covariance study provided method context. It tested two change scores in another dataset. We tested baseline against change in EEG. Its data files were not used in the EEG calculations.

  3. usesChanges in the frequency of posterior 8 to 13 Hz EEG maxima agreed less than levels across separate 60-second segments in 206 ds005385 v1.0.3 adults sci:sha256:e9bfed94b5c6f1f449d75a8ee257fdbb96681c1d2d1d079dee48f184234e3fec

    This archive supplied all 416 spectral summaries, the fixed cohort, source metadata, the score function, and native validation code. We used them to compare reused and separate baseline to change covariance in the same public EEG sample.

  4. usesThe 95% interval for mean posterior 7–13 Hz EEG frequency change includes zero in 60 adults from ds005385 sci:sha256:dc757aad1c14743018b526b855065cd2dff9e87073164c0ffdc855edb78f80e7

    The separate EDF reader and SciPy spectral check came from this work through the direct source archive. We used the copied code to check two complete native files.

  5. usessci:sha256:1c4555c8245395ae907570b77ef5c891cd62f21030442fe0fec9d57a3917bd0e not known to Sciscape

    The source voltage scale audit and its preserved metadata supplied an interpretation limit. We used normalized digital spectra and made no voltage amplitude claim.

  6. usesdoi:10.18112/openneuro.ds005385.v1.0.3

    The analyzed EEG sample and source records are from OpenNeuro ds005385 version 1.0.3.

  7. doi:10.3389/fpubh.2013.00029

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