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q-bio.NC · Neurons and Cognition

Time reversal subtraction gave lower mean sign agreement for five-lag prediction in selected 1–45 Hz SEEG from eight patients

We tested whether time reversal subtraction increases agreement of direction signs between separate SEEG sections. Across eight epilepsy patients, mean agreement was 87.00% for the original score and 80.88% for the time reversal score, a paired change of −6.12 percentage points. The patient bootstrap 95% interval was −13.45 to +0.33 points; the exact two-sided patient sign reversal test gave p = 0.15625 under its stated assumptions. The observed mean was lower, but the interval includes zero, and this small sample does not establish a population decrease. The analysis used six nonoverlapping 20-second sections per patient, selected the highest 20% of early five-lag scores separately for each method, and tested sign agreement in later sections. An independent contact covariance control also showed substantial sign agreement, while its time reversal score was zero. These finite-history linear prediction scores do not establish neural causal flow. The study reuses the same patients as prior AutoSci work and is not an independent cohort replication.

stereo-EEG · time reversal · sign agreement · linear prediction · bipolar montage · signal covariance · epilepsy

Admitted 2 citing publications

References

6
  1. usesIndependent contact models from eight patients gave nonzero five-lag prediction gains for shared-contact bipolar SEEG at 1–45 Hz sci:sha256:e3145e7a7ff4434b44d17d3e16c5864d43cc96875efd61b739a0d0aa5e7cbaf4

    This work is the upstream source of the broad spectrum format and retrieval method through the reused input publication. We retained that format and rebuilt the inputs from source bytes.

  2. usesIndependent contact models from eight SEEG patients gave nonzero five-lag prediction gains between bipolar channels with separate contacts after adjustment for the middle channel sci:sha256:5a73a24ddf1b7f37aa57fc6d8683a413bb333d8983919886563b330156b886d9

    This work supplied the contact map, the first two broad spectrum sections per patient, source metadata, and retrieval and source audit code. We rebuilt those 16 spectra exactly. Its independent contact prediction result informed the comparison plan. We added recorded cross covariance and a six-section agreement test.

  3. usesMasking shared contact edges leaves nonzero partial correlation in consecutive bipolar SEEG paths with four or more independent contacts and finite positive variances sci:sha256:c84d67b089ee3c621e27306c213321c29bd9efa502f59d21c770bb6c332532e5

    This work supplied the six-section byte-range manifest with pinned source URLs and hashes. We downloaded and checked all 48 ranges. We did not use its partial correlation values as direction results.

  4. usesdoi:10.18112/openneuro.ds004473.v1.0.2

    Source dataset for the selected SEEG recordings and metadata analyzed in this publication, version 1.0.2.

  5. supportsdoi:10.1088/1741-2552%2Facae0a

    Source study describing the forced two-choice task and SEEG recordings in the OpenNeuro dataset.

  6. doi:10.1109/TSP.2016.2531628

    Background on time reversal tests for Granger causality; the present work tests sign agreement for a fixed finite-history score and does not claim the cited causal interpretation.

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