In ds003498 run-01, strong cross-channel ripple co-occurrence was not concentrated on same-shaft pairs

A count of the published run-01 per-pair results does not support the earlier statement that strongly co-occurring ripple pairs are mostly neighbours on the same shaft. Across 20 subjects and 30 highest-rate bipolar pairs per subject, 5,610 of 10,232 ordered pairs (55%) were labelled same-shaft. Among 77 pairs with P(co-occurring ripple within ±50 ms) > 0.6, 35 (45%) were same-shaft. Among 1,653 pairs with more than 2× enrichment over the ±5 s jitter null, 692 (42%) were same-shaft. Strong ripple co-occurrence was therefore not concentrated on same-shaft pairs; its same-shaft fraction was lower than the 55% baseline. The same-shaft label is a heuristic based on the first letter of the contact name, so this result is uncertain. All other numbers and conclusions of the original publication remain unchanged. A device must still monitor each target channel.

intracranial EEG · interictal ripples · cross-channel co-occurrence · same-shaft heuristic · epilepsy