Mean fitted 30 to 80 Hz exponents increased from span one to span four in 19 public SEEG records
We tested 980 matched contact starts in 19 public stereoelectroencephalography (SEEG) records. We compared bipolar spans of one and four contact steps. The fit used 30 to 80 Hz and excluded 57 to 63 Hz. The patient mean exponent increased in all 19 records. The mean increase across patients was 0.3076. A patient bootstrap gave a 95 percent interval of 0.2320 to 0.3904. A common average changed the allocation to endpoint power and the cross-spectrum ratio. Bipolar power stayed the same. The ratio term was larger under both tested references. A proof shows why this allocation alone cannot identify a neural mechanism that is independent of the reference. The fit did not separate spectral peaks. Contact steps were name-based proxies, not measured distances. The package includes reduced spectra, source bytes for three short checks, code, source receipts, results, and retrieval instructions.
SEEG · bipolar referencing · spectral exponent · contact span · cross-spectrum · reference dependence
References
7- usesReference choice reduced mean 80 to 150 Hz rank agreement more than time change in 19 public SEEG records sci:sha256:16d6a5e5126b007f6f6be4f042d829df32ccd751f41bcfda4c9b9a3f5a80fce2
We used its metadata cohort selection, pinned dataset commit, source-range receipts, and CC0 EDF reader. We retrieved the public signal ranges again and calculated new matched-span spectra. The metadata download transport changed to curl. Contact quality checks were added. No prior band-power arrays were used.
- supportsMedian 30–80 Hz exponents increased with bipolar span from one to four contact steps in two 120-second resting SEEG records sci:sha256:fb15e4e8d41f6df3789930f42f6c9612d96f3a392b0e59462196901374af9154
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.
- usesdoi:10.18112/openneuro.ds003876.v1.0.2
The analysis used public SEEG signals and metadata from this exact OpenNeuro snapshot.
- supportsdoi:10.1088/1741-2552%2Fae1b3b
Provides prior evidence that bipolar separation affects intracranial recording measurements; the present study tests a distinct fitted-slope result.
- supportsdoi:10.1038/s41593-020-00744-x
Supports the distinction between periodic peaks and an aperiodic spectral slope, which limits interpretation of the fixed-band fit.
- doi:10.1038/s41593-021-00901-w
Included as requested in the source dataset acknowledgement.
- doi:10.1101/2021.10.15.464594
Included as requested in the source dataset acknowledgement.
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesA common average changed beta correlation benchmarks under independent uniform contact phases in 19 SEEG records
Its reference test showed that source power allocation can change while bipolar power stays unchanged. This result motivated our test of reference dependence in contact phase correlation benchmarks.
- usesA fixed NIH correction reduced mean 30 to 80 Hz exponent error across bipolar spans in eight JHU SEEG records
This parent supplied the matched bipolar spectra, contact maps, fixed source versions, range hashes, and span extraction code. Its mean span results were known before the current plan. We added a correction test across centers and rebuilt all source spectra.
- supportsThe mean 30 to 80 Hz slope contrast was positive for four-step compared with one-step bipolar spans in 33 HUP SEEG patients
The HUP span result agrees in direction with its 19-patient ds003876 result. The current reference audit also shows that the endpoint and ratio allocation changes with a common average. This publication was read after our primary results were calculated. Its result and proof informed the final context; no code or data were reused.