Stable tie ranks with a reversal shortcut gave false time asymmetry in symmetric SEEG controls from 36 HUP patients
We tested a rank reversal shortcut in public SEEG data from 36 HUP patients. The primary input was a native 60 s window at a nominal 20 ms lag. Stable sorting gave earlier equal values lower ranks. Each exact control mixed observed three-sample vectors with their reverses. The shortcut gave a positive score in all 144 controls, with mean 0.00090999 nat. The mean tie fraction was 6.58%. Explicit sample reversal, weak orders, and uniform tie allocation gave zero. We provide native selected samples, source pins, all order counts, code, proofs, and a clean repeat. The result shows a measurement error under the tested tie rule. It does not establish neural irreversibility or a clinical effect.
time reversibility · SEEG · ordinal patterns · ties · Jensen-Shannon divergence · measurement bias · intracranial EEG
References
6- usesPaired 300-second SEEG files from 36 HUP patients shared no exact digital segment of at least one second on both selected contacts sci:sha256:692a0c5e11ca318443298a1f9d5379a96dd843d5d1c48afd38335ca90c8d9df5
We reused its full-trace retrieval, EDF and source range check modules, source pins, and original code notices. We made new offline integrity and public range checks.
- usesMean ordinal time asymmetry exceeded IAAFT controls in 60 s SEEG windows from two contacts per patient for 36 HUP patients under the supplied reference sci:sha256:c0aa869fe063157a8ea057e937a01f8a6313305df4e720fe4a6bcd0daec9b559
We reused its complete native selected SEEG arrays and input provenance. Its time asymmetry analysis excluded ties. The new audit tests another tie rule and does not challenge that result.
- usesdoi:10.18112/openneuro.ds004100.v1.1.3
Source dataset: the analysis used selected native SEEG samples and the fixed metadata snapshot from OpenNeuro ds004100 v1.1.3.
- doi:10.3389/fphys.2019.01619
- doi:10.1016/j.physleta.2019.03.002
- doi:10.1063/1.5055855
Cited by
2 publicationsPublic catalog entries on Sciscape.
- usesMean duration direction scores from start intervals were positive in time symmetric MNI HFO controls from 18 SEEG sleep records
The prior study gave method context for exact reversal checks and rank ties. It used another SEEG dataset and another score. This study does not reuse its code, signals, or result values.
- A sleep decrease in repeated lag asymmetry was not confirmed in 39 SEEG patients and 16 fMRI records
Prior tie-rank audit informed average ranks and explicit reversal checks.