The adjusted Alzheimer and control alpha entropy pooling contrast had a 95% interval that included zero in 65 ds004504 v1.0.9 records with 100 accepted seconds

We tested the effect of pooling EEG power matrices on an alpha spatial entropy group contrast. The source was OpenNeuro ds004504 version 1.0.9. The main sample had 36 Alzheimer records and 29 control records. Each score used 19 centered scalp channels and the first 100 accepted seconds. Power weights matched the arithmetic mean of unnormalized matrices. The model included age and the recorded Gender field. The estimated pooling change was 0.023153 nats. Its approximate 95% person bootstrap interval was -0.002583 to 0.052621 nats. The interval included zero. The main test did not establish a pooling change in the adjusted group contrast. Pooling increased entropy in all 88 records, which included 23 frontotemporal dementia records. The established entropy identity explains the sign, but it does not identify a biological cause. The report gives all six planned secondary checks. The package supplies a tested audit tool and new scores. It preserves input matrices, source hashes, code, a proof, random draws, results, figures, and reproduction instructions. Independent calculations checked every saved contrast draw. Three fresh EEG sources passed replay checks. One complete source file permits offline checks. This single-site study does not establish causal disease effects or diagnostic accuracy.

EEG · spatial entropy · omega complexity · matrix pooling · Alzheimer disease · frontotemporal dementia · bootstrap · OpenNeuro