Independent contact phase controls before bipolar referencing retain negative correlation between channels that share a contact in two 120-second SEEG segments
We tested a phase control for bipolar SEEG correlation under independent recorded contacts. We analyzed seconds 5-125 in each of two resting records from OpenNeuro ds005670, version 1.0.0. Each person had six 20-second epochs and 199 controls per epoch. Contact phase controls before bipolar referencing retained negative correlation between channels that share a contact. Their median correlations were -0.497 and -0.496. Controls after referencing had medians near zero. On an extra contact phase control, the first method rejected 4.69% and 5.33% of shared edge and epoch combinations. The nominal lower-tail threshold was 5%. Controls after referencing rejected 99.65% and 99.67%. This is a public data benchmark of a known shared-contact effect. The package contains source code, source metadata, a verified data retrieval recipe, saved correlations and controls, figures, quality checks, and reproduction instructions. It does not contain raw signal samples. The results apply to the stated phase model and two short data segments. They do not identify neural connections or estimate a population effect.
stereo-electroencephalography · SEEG · bipolar referencing · phase randomization · correlation · null model · shared contact · signal processing · reproducibility
References
3- usesdoi:10.18112/openneuro.ds005670.v1.0.0
The publication analyzes the 1.0.0 snapshot of this dataset; the source metadata records this version-specific DOI and CC0 license.
- doi:10.1016/j.neuroimage.2018.08.020
- doi:10.1093/braincomms%2Ffcae165
Cited by
4 publicationsPublic catalog entries on Sciscape.
- usesCommon references changed the 30–80 Hz power slope split while bipolar slopes stayed fixed in two 120-second resting SEEG sections
We copied its MIT EDF reader without changes. The reader enabled full source extraction and raw fixture checks. The package retains its license and code hash.
- usesShuffles across all time windows rejected 5.41 and 5.68 percent of log beta power controls with independent orders within ten-second blocks in two SEEG records
We used the unchanged EDF reader, label normalization rule, byte-prefix retrieval code, pinned raw source manifest, and source metadata. We rebuilt all new powers from fresh public source bytes. Earlier features and results were not inputs. The patients and source interval overlap with this parent.
- usesMean beta correlation dimension was below the independent contact phase control mean after adjacent subtraction in 19 selected SEEG records
Its source contact phase control retained the shared-contact correlation from adjacent subtraction. This result informed our choice to randomize recorded contacts before each montage. We extend the benchmark to correlation dimension and an exact expected load. We do not claim the shared-contact effect as a new discovery.
- usesMedian 30–80 Hz exponents increased with bipolar span from one to four contact steps in two 120-second resting SEEG records
We copied its MIT-licensed EDF reader and retrieval code without changes. We used its byte-prefix pins and source metadata. We retrieved source voltage bytes again and built new spectral arrays.