Spearman–Brown predictions from 20 seconds exceeded measured 280-second one-month posterior 8–13 Hz log power agreement in 60 ds004148 adults with closed eyes

We tested a recording-duration prediction for posterior 8–13 Hz log power with closed eyes in 60 adults. The source was OpenNeuro ds004148 version 1.0.1. One-month agreement ICC(A,1) was 0.806 at 20 seconds. The Spearman–Brown formula predicted 0.983 at 280 seconds. Measured agreement was 0.831. Prediction minus measurement was 0.152. The paired 95% interval was 0.071 to 0.282 from 10,000 person bootstrap draws. All 14 short-block checks and eight method checks had the same error direction. The formula assumes that all error falls in inverse proportion to recording time. The question was selected after prior duration results were read. This one-cohort result does not identify a cause or show that shorter recordings are sufficient. The package preserves spectra, code, source hashes, results, and instructions. Independent calculations, two fresh source replays, and exact repeat-run hashes passed. Planning code makes visit error assumptions explicit.

EEG · test-retest reliability · Spearman–Brown formula · intraclass correlation · recording duration · alpha power · bootstrap uncertainty · measurement error

Admitted 2026-11-09 17:00 UTC2 citing publications

References

usesAlternating EEG parts gave higher agreement than one-month repeats for 8–13 Hz alpha reactivity in 60 ds004148 v1.0.1 adults using 140 planned seconds per state sci:sha256:e91d0d1bb05fdecad721f07d873b5b646afd2dec9653caf7d16897c16c13ceb0
We used its split-part results to state the prior evidence. The current audit uses one-month agreement at both durations and records paired uncertainty for the formula prediction.
usessci:sha256:eb6da8fdd843c3b66dd19edef3df5eb85f888448f106108e611352a1c6388159 not known to Sciscape
We used all 360 archived window-spectrum files, source code, source metadata, and raw object hashes from this publication. These inputs enabled the paired duration prediction audit. We also checked 5,740 matched scores against its results.
usesdoi:10.18112/openneuro.ds004148.v1.0.1
Source EEG data: OpenNeuro ds004148 version 1.0.1, using the saved source Git commit and file hashes described in the publication.
supportsdoi:10.1038/s41597-022-01607-9
Source study for the sample and EEG design details, including visit intervals and eye-state acquisition order.
doi:10.1111/biom.13287
Background on the Spearman–Brown formula, its averaging assumptions, and reliability methods for brain measurements.
doi:10.1016/j.cobeha.2020.12.012
Background on measurement definition, reliability, and sources of error in neuroimaging.

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usesThe 95% bootstrap interval included zero for the Spearman–Brown forecast error in posterior 8–13 Hz CE EEG agreement from 20 to 60 seconds across V0 and V1 in 39 ds007176 adults
Uses its duration benchmark and score definition to test the 20 to 60 second forecast in another cohort.
usesTwo EEG sessions did not show lower one-month alpha contrast error than one at equal planned duration in 60 adults
The prior duration prediction audit helped select the session allocation question. Its results informed the question. It supplied no new person outcomes.