Assuming independent normal person scores, the 95% interval for the P3 letter interval slope difference included zero in 50 ds006018 adults

We tested whether Pz voltage had a larger letter interval slope for targets than for other letters. The source was OpenNeuro ds006018 version 1.2.2. Fixed rules retained 50 adults and 7,181 trials. The mean target slope minus other slope was 0.509 microvolt per interval doubling. Its 95% t interval was -0.100 to 1.118. A person bootstrap interval also included zero. The t model assumes independent people and a normal distribution of person scores. Adding response time changed the interval. The average scalp reference reduced the mean difference. These checks are secondary. The primary result does not establish a larger increase for targets or equal slopes. The package preserves full stimulus history, trial decisions, coefficients, source hashes, and code. Independent calculations checked all fits. Fresh original EEG replay checked all 96 complete records.

P3 · P300 · electroencephalography · event-related potentials · letter interval · target detection · OpenNeuro · replication