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eess.SP · Signal Processing

Gap replacement changed beta contrasts under the specified Butterworth filter in 35 SEEG records from 21 patients

We tested whether gap samples affect beta power contrasts in public SEEG records. The source was OpenNeuro ds006519 version 1.0.0. We used 35 records from 21 patients and 1754 channel-record entries. Only gap samples were replaced. The primary filter was a forward and reverse 13 to 30 Hz Butterworth bandpass with prototype order four. Each before and after window lasted 0.5 seconds, with no gap margin. The mean patient fraction with an absolute contrast difference above 1 dB was 5.28%. Its 95% patient bootstrap interval was 3.46% to 7.40%. We averaged records within patients and gave patients equal weight. Intervals require independent patients. A half-second margin sharply reduced the measured dependence. We provide a conditional contrast bound and a finite-support proof for a single centered FIR pass. One zero-power channel produced misleading FFT dB ratios. Direct convolution identified that case. An exploratory exclusion changed the primary fraction to 5.25%. This test measures processing dependence. It does not isolate artifacts or estimate a causal brain response. The package preserves code, all channel statistics, raw examples, source hashes, pinned retrieval links, results, figures, and repeat instructions. Thirteen saved analysis and audit files were byte-identical on repeat.

stereoelectroencephalography · SEEG · signal processing · beta power · filtering · gap replacement · finite impulse response · Butterworth filter

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References

4
  1. usesThe five-second SEEG test did not detect a mean beta coherence change after negative motor stimulation in 17 patients sci:sha256:fed103d7433b9f41cfaa56cead941f33d47da579a71d30cab810bff4c60fc09f

    We reused its BrainVision reader and source object retrieval manifest. We retrieved and checked all raw signals against the source tag. The new test uses native-rate full-record filters and gap replacement. It does not reproduce the earlier coherence measurement.

  2. usesUnder patient independence and sign symmetry, the three-second SEEG test did not detect a mean beta power contrast between stimulated and other shafts in 19 patients sci:sha256:d17ca5709c7f227838b3047abaf695a8409ce220bf2f347b1da350ea2be8f247

    Its source timing description helped define the marked gap and the test limits. The report was read before the internal plan. Its numerical power results did not enter this analysis.

  3. usesdoi:10.18112/openneuro.ds006519.v1.0.0

    The analysis used all 35 signal records in OpenNeuro ds006519 version 1.0.0; the source hashes and pinned retrieval links are preserved.

  4. doi:10.1016/j.neuroimage.2026.121822

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