A circular shift test did not detect late ECG peak template repeatability in nine adult rest SEEG records with bipolar reference

We tested late ECG peak template agreement in nine adult epilepsy rest SEEG records from OpenNeuro ds003688, version 1.0.7. We used all 518 adjacent bipolar pairs and two separate 50-second blocks. The tested window was 203.125 to 500 ms. The equal-adult signed mean was 0.000585. The one-sided circular shift p value was 0.3835 from 1,999 controls. The 95 percent adult bootstrap interval was -0.006255 to 0.006180. The timing test assumes exchangeability under independent block rotations. The bootstrap assumes independent adults. This result does not establish absence of a heartbeat response or identify a signal source. It is a separate late-window test in an existing cohort, not an independent replication. The package preserves exact inputs, code, source metadata, timing controls, templates, results, and reproduction instructions. Fresh source ranges reproduced all nine inputs exactly. Direct epoch checks and a complete second analysis passed.

stereoelectroencephalography · electrocardiography · event-related templates · bipolar reference · repeatability · circular shift test