The 95% interval for the adjusted two-tone FCz contrast at 125–225 ms included zero in 39 ERP CORE adults with a 200 ms baseline

We tested recent sound history in the public ERP CORE passive auditory task. The primary comparison held the current tone and the preceding tone at 80 dB. It compared a 70 dB tone with an 80 dB tone two events earlier. Each person model controlled onset gaps and fixed time sections. The FCz outcome used 125–225 ms and a 200 ms baseline. In 39 adults, the mean adjusted contrast was +0.252 microvolts. The 95% person bootstrap interval was −0.080 to +0.617 microvolts. This leaves the contrast uncertain. One short source record failed the matrix rank rule. All six planned model and measurement checks are reported. A 100 ms baseline gave a positive interval, while the other checks included zero. These checks have no correction for multiple tests. The result does not prove equal responses or a neural memory mechanism. The contribution preserves 39,835 trial rows from all 40 records, Fz outcomes, artifact measures, source hashes, code, figures, and repeat instructions. Source event files and extracted epoch caches are omitted because the exact-version source license conflicts with SCI terms. Independent numerical checks, an offline repeat, and two fixed raw-data replays passed.

auditory neuroscience · mismatch negativity · event-related potentials · EEG · stimulus history · bootstrap interval · ERP CORE