Weights of 1/f reduced the mean fitted 2–30 Hz posterior EEG eye-state exponent contrast in 60 ds004148 adults
We tested whether frequency weights change a posterior EEG exponent contrast. We used 360 public spectral records from ds004148 version 1.0.1. They cover 60 adults, three sessions, and two eye states. Each exponent came from a straight-line fit of log power against log frequency. We kept the 2–30 Hz power values and bins fixed. We compared equal bin weights with weights of 1/f. The mean closed-eye minus open-eye contrast was 0.245 with equal weights. It was -0.034 with weights of 1/f. The paired reduction was 0.279. Its 95% participant bootstrap interval was 0.247 to 0.312. The interval for the second contrast included zero. The exact 7–14 Hz contribution changed from 0.141 to -0.085. A formula and a fixed synthetic example explain this change. Separate regressions passed all checks. A complete rerun gave identical files. Two raw EEG downloads gave the same saved spectra. The package contains data, code, hashes, results, and instructions. These straight-line exponents do not establish a change in aperiodic brain activity.
EEG · frequency weighting · spectral exponent · aperiodic activity · linear regression · bootstrap · OpenNeuro ds004148
References
5- usessci:sha256:eb6da8fdd843c3b66dd19edef3df5eb85f888448f106108e611352a1c6388159 not known to Sciscape
We reused all 360 spectral files and their source extraction code and provenance. These fixed inputs enabled the frequency weight comparison and exact frequency partition.
- usesdoi:10.18112/openneuro.ds004148.v1.0.1
The analysis used 360 spectral records from OpenNeuro ds004148 version 1.0.1; saved file hashes identify the archived inputs.
- doi:10.1038/s41593-020-00744-x
- doi:10.1111/psyp.70272
- supportsdoi:10.1038/s41597-022-01607-9
This source paper documents the sample, session timing, fixed eye-state order, and eye-movement component removal described here.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- usesRemoving 7–14 Hz lowered repeat agreement of 2–30 Hz posterior EEG slopes with equal bin weights in 60 ds004148 adults with closed eyes
Used the documented exponent coefficient formula and prior evidence that bin weights change the measure. These results guided the fixed weight check and the exact band contribution check.
- Weights of 1/f lowered mean fitted 2–30 Hz EEG exponent contrasts in 38 ds007176 adults, including fits without 7–14 Hz
[Legacy relation: reproduces] This study tested the earlier fixed 2–30 Hz equal-bin versus 1/f weighting direction in a separate public dataset. The mean CE minus OE method difference was positive in 38 ds007176 adults. The signs of both state contrasts did not transfer. This study also used the exact coefficient identity and added planned band exclusion fits.
- usesA Jensen gap projection gives the exact EEG exponent shift from mean and log order for positive power and fixed log-log fits with an intercept
The fixed negative-slope coefficient formula informed this implementation. We used that linear form to derive the Jensen gap projection. No result files or code from that comparison were used.
- Weights of 1/f lowered mean fitted 2–30 Hz EEG exponent contrasts in 38 ds007176 adults, including fits without 7–14 Hz
[Legacy relation: reproduces] This study tested the earlier fixed 2–30 Hz equal-bin versus 1/f weighting direction in a separate public dataset. The mean CE minus OE method difference was positive in 38 ds007176 adults. The signs of both state contrasts did not transfer. This study also used the exact coefficient identity and added planned band exclusion fits.