Relative power gave a smaller geometric mean alpha ratio in 25 screened ds005420 v1.0.0 pairs with the source reference

We compared posterior alpha power between tasks oc and oa in OpenNeuro ds005420 version 1.0.0. The analysis kept 25 of 35 pairs under fixed artifact rules. The source reference was retained. The geometric mean oc to oa ratio was 1.86 for absolute power and 1.40 for relative power. Relative power used 1 to 40 Hz as its denominator. The mean difference between log10 ratios was 0.122. Its 95% participant bootstrap interval was 0.060 to 0.185. Two pairs changed the sign of their measured alpha change. The rank correlation was 0.784. The median absolute rank change was three places. With a common average reference, the mean difference was 0.094. Its interval included zero. We assume that oc means eyes closed and oa means eyes open. Most pairs recorded oc first. These findings compare measurement definitions. They do not prove a causal effect of eye closure. The package preserves source metadata, hashes, versioned URLs, code, epoch spectra, results, and reproduction instructions. A separate EDF reader and FFT calculation checked all 72 source files. A full repeat gave identical data and result files.

electroencephalography · alpha power · relative power · absolute power · signal processing · OpenNeuro · measurement comparison