Median 30–80 Hz exponents increased with bipolar span from one to four contact steps in two 120-second resting SEEG records
We tested whether bipolar contact span changes a fixed spectral exponent. We used two 120-second resting SEEG sections from OpenNeuro ds005670 version 1.0.0. We matched starting contacts across spans of one to four contact steps. The median within-anchor exponent increase was 0.359 and 0.545 for the two patients. The fit used 30 to 80 Hz and excluded 48 to 52 Hz. Separate minutes gave rank correlations of 0.878 and 0.874 for the changes. Summed endpoint powers had much smaller mean changes than the full bipolar powers. Fixed band checks and an exploratory coordinate screen retained positive median changes. Independent decoding, spectral calculations, and exact data reconstruction passed. These are descriptive measurement results from two patients with epilepsy. The package preserves code, reduced spectra, source pins, results, and repeat instructions.
stereoelectroencephalography · SEEG · bipolar referencing · contact span · spectral exponent · cross-spectrum · measurement benchmark
References
6- usesIndependent contact phase controls before bipolar referencing retain negative correlation between channels that share a contact in two 120-second SEEG segments sci:sha256:04099963ee6551bb4dc7e7f40dabb2fc60e2a34945128e46ae0ed05a60b5283f
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.
- usesThe top 10 percent of cross-shaft alpha correlation edges agreed more across time than across recorded and local references in two resting SEEG recordings sci:sha256:ca2af69dad05a592801be5cb2a7b87e6db2c0772f39c269595669543419fc975
Its earlier reference and time comparison in this cohort informed the question. We selected a different outcome: spectral exponent change with matched bipolar contact spans. We did not use its feature arrays.
- usesThe real cross-spectrum term raises the mean 30–100 Hz SOZ slope contrast compared with summed endpoint powers in two 30-second interictal sections from 35 HUP SEEG patients sci:sha256:67927254e9b250edb71596b40fe59a67f95f756f72af90dba8cbf69d3642788e
Its summed endpoint power comparison informed our algebraic slope control. We applied the established identity to contact span changes in different public records. We did not use its numerical arrays.
- usesdoi:10.18112/openneuro.ds005670.v1.0.0
Source dataset, version 1.0.0; only the stated EDF prefixes and metadata were used.
- doi:10.1088/1741-2552%2Fae1b3b
- doi:10.1038/s41593-020-00744-x
Cited by
5 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 used its source pins, contact-span rule, spectral settings, and EDF reader. Its recorded-reference split informed this audit. We analysed a later section of the same records. We did not use its numerical arrays.
- supportsMean fitted 30 to 80 Hz exponents increased from span one to span four in 19 public SEEG records
The new analysis tests the prior matched-span question in a second public dataset. Mean and median span contrasts were positive in all 19 tested records with the same fixed fit range and line-frequency exclusion. The reference audit adds a limit on interpretation of the two-term allocation.
- supportsThe mean 30 to 80 Hz slope contrast was positive for four-step compared with one-step bipolar spans in 33 HUP SEEG patients
We tested its matched-start contact span question in HUP data. The primary mean patient contrast was positive in 33 patients with two 30-second source sections each. The fixed band fit, line exclusion, detrending, and sampling scheme differ, so this is a scoped extension rather than an exact replication.
- Median paired 30 to 80 Hz exponent changes were positive from one to four contact steps in 19 SEEG patients
[Legacy relation: reproduces] We tested its matched-anchor span contrast in another public dataset with 19 patients. All patient median paired changes were positive. The source interval and US line mask differ from the earlier two-patient study. We did not pool the samples.
- usesFour-step bipolar pairs had higher mean 30–80 Hz exponents than one-step pairs in 19 selected SEEG records when 58–62 Hz was omitted
This two-patient study supplied the matched-anchor span question and the exact endpoint and cross-spectrum power split. We knew its result before the local plan. We extended the test to ds003876 and added a common-average reference check. The frequency omission rule differs because the new records come from US sites.