With linear age and Gender adjustment, 65 processed ds004504 v1.0.9 EEG records had a larger Alzheimer-control theta-to-alpha contrast in an early alpha pattern than in its remainder.

We tested whether the Alzheimer-control EEG theta-to-alpha contrast depends on a fitted spatial pattern. We used OpenNeuro ds004504 version 1.0.9. We fitted each person's leading alpha pattern on the first ten accepted 10-second windows. We measured its power and the remaining power on the last ten windows. The sets did not share windows. The main sample had 36 Alzheimer records and 29 control records. With linear Age and recorded Gender adjustment, the contrast was 0.689 log10 units in the pattern and 0.441 in the remainder. The paired difference was 0.248, with a 95% stratified person-bootstrap interval of 0.120 to 0.366. Time reversal and all other fixed checks gave positive differences. A descriptive follow-up found a smaller alpha power fraction in the pattern in the Alzheimer group. This is an association in one processed scalp EEG cohort. It does not locate a neural source or establish diagnostic accuracy. The package preserves all matrices, source metadata and hashes, code, fitted weights, bootstrap draws, figures, and reproduction instructions. Three source records passed new signal checks. A second full analysis reproduced every result table and numeric array.

scalp EEG · theta-to-alpha ratio · alpha spatial pattern · Alzheimer disease · power partition · person bootstrap