A test of one-second imaginary coherency did not establish beta SEEG rank agreement above phase controls in 21 patients

We tested whether beta SEEG channel ranks agreed across separate one-second windows before stimulation. The study used all 35 recordings from 21 patients in OpenNeuro ds006519 version 1.0.0. The primary score used absolute imaginary coherency from three overlapping spectral segments. We removed edges between bipolar channels that shared a physical contact. The control used 200 independent phase-randomized signal pairs per recording and kept each channel spectrum. The patient mean rank agreement was -0.0147. The observed-minus-control difference was -0.0155, with a 95 percent patient bootstrap interval of [-0.0684, 0.0354]. The exact two-sided patient sign-flip test gave p = 0.5752 under independent patients and symmetric differences. The test did not establish agreement above the control. It did not prove equality. Magnitude coherency had a small positive descriptive rank difference. The highest-score channel matched in only 1 of 35 recordings for each measure. Independent noise produced a mean absolute imaginary score of 0.339 with the same one-second estimator. The package includes all event arrays, source metadata and hashes, code, 28,000 control rows, results, and three figures. All 355 original files passed source checks. Fresh extraction and analysis reproduced the core outputs. The result concerns this offline estimator and sample. It does not test decoding or stimulation benefit.

stereoelectroencephalography · imaginary coherency · magnitude coherency · rank agreement · phase controls · brain-computer interface

Admitted 2026-11-09 17:24 UTC2 citing publications

References

usesA paired test did not establish higher beta SEEG rank repeatability when windows increased from 0.5 to 1.0 seconds in 21 patients sci:sha256:a7dacb173b26efb78dae0015aa13b67255ee4c540f2aff00b86a64af83d72ce6
Used its separate one-second window design. Its correlation rank result motivated a new test of imaginary coherency with spectral phase controls. The patients are the same, so this study is not an independent patient replication.
usesBipolar SEEG pairs with a shared contact have higher mean absolute beta correlation than the nearest pairs with separate contacts in 21 patients sci:sha256:f9206e6467700c572ec5f73a7622ca0b4d27200ce928e5b1393ab3a0c47567c8
Used its checked event arrays, source metadata, source manifest, retrieval and extraction code, and physical-contact mask code. Its shared-contact result motivated exclusion of shared-contact edges.
usesdoi:10.18112/openneuro.ds006519.v1.0.0
The analyzed data are OpenNeuro ds006519 version 1.0.0.
doi:10.1016/j.neuroimage.2026.121822
supportsdoi:10.1016/j.clinph.2004.04.029
This source supports the stated imaginary-coherency property under non-interacting sources and instantaneous mixing.
supportsdoi:10.1007/s10548-017-0609-4
This source supports the statement that finite data length can reduce sensitivity of imaginary coherency.
supportsdoi:10.1093/braincomms%2Ffcae165
This source supports the statement that reference and measure choices can change intracranial EEG network results.

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usesDebiased squared weighted phase lag scores did not establish better one-second beta SEEG rank agreement than absolute imaginary coherency in 21 patients
Used its short-window question and two window bounds. This study compares dwPLI with ImC on edges between shafts and with matched shaft phase controls. It reuses the same patients.
usesTwo-second SEEG windows did not establish better beta imaginary coherency rank agreement above phase controls than one-second windows in 21 patients
We used the saved ds006519 source manifest and adapted its contact parser, retrieval code, and spectral and rank routines. We downloaded and checked all raw source files again. The earlier one-second result was known before the local plan. This work adds a paired one-second versus two-second test with fixed spectral resolution, matched window centers, and paired phase controls in the reused patient group.