A centered FIR filter with 1691 taps changed 0 to 100 ms Pz means in 13 adults when later input was held constant

We tested continuous EEG from 13 adults in OpenNeuro ds003061 version 1.1.2. A fixed centered FIR filter used 1691 taps and edges at 0.5 and 30 Hz. The feature was a 0 to 100 ms mean minus a -200 to 0 ms baseline mean. Each window excluded its upper limit. We held input constant after the final feature sample at 97.65625 ms. Across 24,071 trials, the equal-person mean absolute change was 1.659 microvolts. The 95% person bootstrap interval was 1.298 to 2.068 microvolts. Exact weights used input through 3.3984375 seconds after stimulus onset. With unseen changes limited to 20 microvolts, the sharp bound first reached at most 0.1 microvolt at 2.48828125 seconds. Only 4.88% of trials met this input limit at the early deadline. A proof and tool provide bounds for fixed linear features under stated input limits. The package preserves lossless traces, source hashes, code, trial results, and reproduction instructions. This audit measures processing dependency. It does not establish neural onset.

electroencephalography · finite impulse response filter · signal processing · temporal filtering · input dependency · deadline audit