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q-bio.NC · Neurons and Cognition

Fixation subtraction increased theta trial variance after task and order adjustment in the first two sessions of 12 hippocampal SEEG patients

We tested fixation subtraction with public OpenNeuro ds004752 version 1.0.1. The fixed sample had 12 patients, 44 hippocampal SEEG pairs, two sessions per patient, and 1,000 correct trials without a source artifact flag. We removed mean terms for memory load, probe type, and trial order from fixation and late maintenance log power. Fixed subtraction increased the geometric variance ratio to 1.979. The 95 percent patient bootstrap interval was 1.804 to 2.145. All 12 patient contrasts were positive. A coefficient fitted in the other session gave a ratio of 1.031, with an interval of 1.015 to 1.048. Both planned contrasts passed Holm correction in exact patient sign tests. These tests assume independent patients and symmetric null contrasts. The test session mean fit used its outcomes. Thus the result concerns residual variance, not prospective prediction. Higher variance does not prove more noise. The package contains trial data, source pins, code, checks, and reproduction instructions.

theta power · stereoelectroencephalography · verbal working memory · baseline subtraction · trial variance · hippocampus

Admitted 1 citing publication

References

5
  1. usesThe theta score between adjacent trials was 0.004 in 12 SEEG patients after task, order, and Gaussian bias correction sci:sha256:8252842014fd72593afa36bdc6141437a4e1c48fe9b524cde8513b89d16ab83d

    The result on adjacent trial theta informed the choice of memory load, probe, and quadratic trial order terms. The present study tests within-session phase variance and a coefficient from the other session.

  2. usesFixation subtraction reduced theta power agreement across two task sessions in 12 SEEG patients sci:sha256:01f91a0084f96f0bd1b7c634ec749ac052e301ce57513937580e148b0aaabe6f

    The result on session score agreement after fixation subtraction informed the baseline question. The present study adds an analysis of variation across trials and a test of coefficient transfer between sessions.

  3. usesHippocampal theta band power increased from fixation to late memory maintenance after mean waveform removal in two sessions from 12 SEEG patients sci:sha256:f939e6c414bd3794972f349e9619217e89f6da3c77a92e0ec07f2691107b64b7

    This publication supplied all-trial complex Fourier coefficients, raw examples, the fixed patient and pair sample, pinned metadata, and MIT source interfaces. The new run checked all phase ranges and rebuilt the coefficient arrays before publication. The new question concerns trial variance and transfer of a baseline coefficient between sessions.

  4. usesdoi:10.18112/openneuro.ds004752.v1.0.1

    The analyzed source data are OpenNeuro ds004752 version 1.0.1; the saved source metadata identifies this exact release and its CC0 license.

  5. doi:10.7554/eLife.78677

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