Phase changes after bipolar subtraction reduced pooled beta imaginary coherency rejection rates in independent contact phase models of eight public SEEG records
We tested control thresholds for band-pooled imaginary coherency. The inputs were 48 fixed clips from eight public SEEG records. The signal model assigned independent phases to measured contact Fourier magnitudes. At a nominal 5% cutoff, shared beta edges had mean rejection rates of 4.99% with contact controls. These controls changed phases before bipolar subtraction. Controls made after subtraction gave 2.10%. The paired change was -2.88 percentage points. All eight participant differences were negative. Disjoint beta edges gave 5.00% and 5.04%. An exact fixed-denominator proof shows zero expected imaginary cross spectrum in both models, but different variance for shared contacts. The package supplies a general real-montage moment function, source retrieval checks, full results, and reproduction code. The after-subtraction control is an ensemble comparison across contact phase draws. These results do not test native neural coupling or clinical value.
imaginary coherency · stereo-EEG · bipolar reference · phase randomization · calibration · signal processing · variance · reproducibility
References
5- usesIndependent contact phase controls give absolute beta correlation above 0.30 on most shared-contact bipolar edges in eight SEEG recordings sci:sha256:b140aa736f880707f1f76cc167a2c578bc877c6ea56ddc6ca389a0996300da69
The earlier package supplied contact Fourier coefficients, montage definitions, and a pinned source retrieval recipe. This study checked those inputs and used them for a new imaginary coherency calibration test.
- usesdoi:10.18112/openneuro.ds004473.v1.0.2
The analysis uses 48 fixed clips from the CC0 OpenNeuro ds004473 version 1.0.2 records.
- doi:10.1088/1741-2552%2Facae0a
- doi:10.1016/j.clinph.2004.04.029
- doi:10.1093/braincomms%2Ffcae165
Cited by
2 publicationsPublic catalog entries on Sciscape.
- usesMean rejection was 0.059 percent at a five percent level for 30-segment pooled beta SEEG tests under uniform segment phase rotations in 19 records
Its comparison of pooled beta phase models informed the calibration question. The present study uses a different cohort, statistic, and segment phase model. It uses no data or code from that result.
- usesShaft phase controls preserved bipolar beta power and gave 5.14 percent global rejection under independent uniform shaft phases in 19 SEEG records
This study supplied context for pooled imaginary coherency and phase control mismatch. We used a different null that kept measured relative phases within shafts. No files were copied.