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eess.SP · Signal Processing

Simulated contact clipping created 70–110 Hz voltage after bipolar subtraction of 1–30 Hz SEEG inputs from eight people

We tested whether bipolar subtraction removes a shared disturbance after contact values reach equal hard limits. We used two 10 s SEEG intervals from each of eight people. The source was OpenNeuro ds004473 v1.0.1. SEEG means stereoelectroencephalography. The first interval set a voltage scale. We removed all frequency content outside 1–30 Hz from the test inputs. We then added the same near-15 Hz sine to each contact. At a contact limit of six scale units and a sine peak of nine scale units, we measured new 70–110 Hz voltage. The median of the eight within-person pair medians was 2.61 µV root mean square (RMS). This was 12.5% of the input bipolar RMS. The linear controls canceled the disturbance to numerical precision. The high-frequency output equaled the band projection of the difference between the two clipping errors. The package contains a fixed input dataset, a limit sweep, code, figures, and checked source retrieval records. This is a discrete processing test. It does not measure stimulation effects or the behavior of a clinical device.

stereoelectroencephalography · SEEG · bipolar subtraction · contact clipping · signal processing · spectral null · brain-computer interface · intracranial recording

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References

6
  1. usesSample clipping raised mean balanced accuracy from 56.5% to 63.8% under simulated 1 mV, 10 ms contact faults in eight SEEG recordings sci:sha256:6087958845b9cc57d8bcb68416df289e3391911947a9d86feda5af71c6fa239e

    Used its reported processing order and fault scope to compare clipping of bipolar waveforms with the present test of contact limits before subtraction. No code, data extracts, or decoder from that publication were used.

  2. usesAn offline median reference created 70–110 Hz voltage from 1–30 Hz SEEG inputs in eight people sci:sha256:404621c2f52f9069133facf722ec222cc635acccf0730258cb13e16a7d9e2181

    Used the exact eight-person SEEG extracts, EDF headers, source byte ranges, BIDS metadata, retrieval code, and spectral-null design. The new analysis tests equal limits on individual contacts before adjacent-pair subtraction.

  3. usesdoi:10.18112/openneuro.ds004473.v1.0.1

    The analysis uses the version 1.0.1 dataset and exact SEEG source intervals documented in the publication.

  4. doi:10.1016/j.brs.2020.05.009
  5. doi:10.1109/TNSRE.2022.3217469
  6. doi:10.1088/1741-2552%2Facae0a

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