Montage differences exceeded sample differences in 1–80 Hz SEEG time scales for 20 of 24 participants

We tested montage sensitivity of signal time scales in OpenNeuro ds005624, release 1.0.0. We used two fixed 32-second samples from each of 24 participants. We selected depth-style contact names and kept the stored common channel gain. We compared adjacent-contact bipolar signals with common-average signals in the 1-80 Hz band. The primary set had 3,377 contacts and 3,007 matched pairs. Montage distance exceeded temporal distance in 20 participants. The median excess was 0.0546 natural-log units, with a 95% participant bootstrap interval of 0.0322 to 0.0731. The exact two-sided sign-test p value was 0.00154. Three band checks gave similar group results. An exploratory variance screen retained a positive effect in 19 participants. The result applies to this signal estimator and these samples. Contact anatomy and physical amplitude calibration were not verified. The package contains spectra, source identities, range hashes, code, results, and reproduction instructions.

SEEG · signal time scale · montage · bipolar reference · common average · autocorrelation · OpenNeuro