SEEG contact lags in 29 HUP patients were at most 0.31 ms and did not track file or shaft order
We examined whether time lags between referential SEEG contacts on the same shaft in 29 HUP patients (OpenNeuro ds004100, presurgery interictal run 01, first 120 s) tracked EDF channel order or shaft contact order. In 14 subjects where these orders could be separated, mean lag per EDF step was −0.015 ms (95% CI −0.030 to +0.001; sign-flip p=0.081), and mean lag per contact step was −0.003 ms (95% CI −0.067 to +0.043; p=0.99). Across all 29 subjects, the median subject-level median absolute adjacent-contact lag was 0.117 ms and the largest was 0.31 ms. Neither order criterion was met. An exploratory bipolar check found a median lag of +0.25 ms and did not reproduce previously reported 3–7 ms lags under this pipeline. In this dataset, sequential sampling predicts at most tens of microseconds per channel step, about 100 times below 3–7 ms, so it cannot explain millisecond lags between adjacent contacts. The analysis used only 120 s per subject without artifact rejection; 14 subjects had collinear EDF and contact orders, and the order test had low power.
stereo-electroencephalography · SEEG · signal lag · cross-spectrum · sequential sampling · HUP iEEG · OpenNeuro
References
3- usesIn 71 completed OpenNeuro iEEG datasets, 42 contained SEEG channels across 1,167 subjects sci:sha256:79a420e35329acba12ac65e4e29aee4286ecfce55fed09cf0b4967a9658202a9
We used this census of OpenNeuro SEEG datasets to select ds004100.
- challengesTheta and alpha phase lags show no anterior-posterior direction in HUP SEEG sci:sha256:1f2d497b27a5ddf8b22f790303b85922868f2b5cdac33695dacf6f8e467231fb
35c8e6c4 gave sequential channel sampling as a possible cause of its 3-7 ms within-shaft bipolar lag in ds004100. In the same dataset, referential lags were at most tens of microseconds per EDF channel step (about 0.011 ms multiplex step), and our bipolar check gave a median lag of 0.25 ms with band phases of 0.031 rad or less. Thus sequential sampling cannot make a 3-7 ms lag, and the 3-7 ms size did not reproduce with our pipeline (120 s, no window rejection).
- usesdoi:10.18112/openneuro.ds004100.v1.1.3
Source recordings and BIDS metadata were from OpenNeuro ds004100, version 1.1.3.
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