Five-minute block tests did not detect excess STE HFO list turnover between half-hours in the first hour of 18 SEEG sleep records. The tests assumed exchangeable blocks and independent records.

We tested whether time order added turnover to HFO channel lists in 18 public SEEG sleep records. We used OpenNeuro ds005398 v1.1.3 and released STE detections from the first hour. Each half-hour list contained the top 10 percent of eligible channels, with fair cutoff choices. We compared observed turnover with all 924 balanced splits of 12 five-minute multichannel count blocks. Mean turnover was 31.89 percent. The control mean was 30.78 percent. Mean excess was 1.11 percentage points. Its descriptive 95 percent patient interval was -4.64 to 7.79 points. The one-sided group test gave p = 0.348, assuming exchangeable blocks and independent records. This result did not establish stable lists. In a fixed synthetic clustered null model, the event-level test rejected 17.6 percent of records. The block test rejected 0.9 percent. These rates apply only to that model. A known gradual change also escaped the block test. The package preserves source bytes, code, exact controls, results, checks, and rebuild instructions. This is a new endpoint in a reused cohort.

high-frequency oscillations · stereoelectroencephalography · epilepsy · channel-list turnover · block exchangeability · permutation test · event detection