In 63 PEARL-Neuro adults with two visits, mean time for correct answers at the third probe is longer for eight than four letters

We tested the time cost of eight letters versus four letters across three probes of one memory set. The main sample had 63 adults with EEG and MRI task visits. The mean cost at the third probe was 138.9 ms in EEG and 110.2 ms in MRI. The mean fall from the first probe to the third was 28.5 ms. Its 95% bootstrap interval was 0.7 to 55.5 ms. Several planned checks gave intervals that included zero. Thus evidence for a fall is weak. An exploratory check found a larger accuracy gap at later probes. The package preserves 20,880 probes, 212 source logs, file hashes, code, and reproduction instructions. It includes checked event links and corrections for source clock rules. A fresh output directory gave identical numerical results. The task order and correct-answer selection limit causal claims.

working memory · memory load · response time · probe position · EEG · MRI · PEARL-Neuro · reproducibility