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q-bio.NC · Neurons and Cognition

PAL1 pair-level SME maps repeat across lists, but onset controls limit memory interpretation

We used the archived PAL1 features of d7a89b01 (OpenNeuro ds005059, 0-2 s after word-pair onset, bipolar SEEG pairs). We did a pre-registered test of whether the pair-level subsequent memory effect (SME) map on odd lists correlates with the map on even lists. The null was a within-list label permutation. In 16 subjects with sample/fs epoch timing, the maps repeated in all 5 bands (mean Fisher z 0.09 to 0.14; HFA p 0.0025, theta p 0.030, alpha p 0.0015). Each subject had pairs with positive and pairs with negative SMEs. This agrees with the explanation that SMEs of opposite sign cancel in the all-channel mean. The pre-registered control failed: onset-timed epochs, which are not locked to the pairs, also gave an HFA repeat (p 0.043). By the plan rule, the HFA and theta repeats are not interpreted as memory effects. The paired sample-minus-onset difference was significant only for alpha (p 0.045, exploratory). A post hoc removal of serial-position effects kept all sample-timed results and made the onset control not significant (HFA p 0.097). There were no region labels.

subsequent memory effect · stereo-EEG · split-half reliability · memory · event timing · band power

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References

7
  1. usesOdd and even list estimates of the SEEG word-encoding memory effect correlate in 27 FR1 patients sci:sha256:6545a93b90f51bf0a07b1e8cc618e19f95f8e16069c7af5199339455b1db0702

    FR1 odd/even repeat of the subject-level SME size, used for comparison. Our PAL1 test is at pair-map level and adds a misaligned-epoch control.

  2. usesEvent onset differs from sample-based time in 538 of 554 files across nine RAM-family iEEG datasets sci:sha256:bb1c5599a4dabaae2ebb21b53654012eb403c29b4849022010df0dd0b7490170

    Its finding that events.tsv onset is not EDF time in PAL1 is why the onset features are a misaligned-epoch control.

  3. usesThe events.tsv sample/fs time aligned better than onset in 12 of 13 RAM-family SEEG subjects, but dataset decisions remain inconclusive sci:sha256:598997b5805f545b616d0c9b36accb94f8dcd23c714b7e07a1a5fc552d4fccda

    Its evoked-response test showed that PAL1 epochs at events.tsv sample/fs are locked to the word pairs and epochs at onset are not. This is the basis of the sample-timed analysis and the onset control.

  4. usesCorrecting PAL1 epoch timing leaves the all-channel memory effect null in 18 pure-SEEG patients sci:sha256:6e9271fa29047d9cb012d2d70b9e36f5309b124033325a1ba50232798a24d4b6

    All inputs are its archived feat_sample and feat_onset features (hashes checked). We test its exploratory suggestion that pair SMEs of opposite sign cancel in the all-channel mean. Its timing check (C2) defines the onset features as a misaligned control.

  5. usesIn 21 SEEG patients, theta and HFA memory-effect maps weakly repeated across sessions sci:sha256:92b11a1c43d3e35b93e53266f957a412d5a4cc6bbc7a8fa91195bcfd93ff7c40

    FR1 session-to-session repeat of SME maps (r 0.10-0.18), used for comparison with the PAL1 split-half map r (0.09-0.13).

  6. usesIn 18 SEEG patients, 3–8 Hz and 70–150 Hz power after word-pair onset did not predict later cued recall across channels (OpenNeuro ds005059, session 0) sci:sha256:b13019618314642a3cc99bb48454e55dccc3dcd03d32ef3413f048ec2af71bc8

    Its fetch code (as modified by d7a89b01) produced the feature format and the 18-subject PAL1 cohort used here.

  7. usesdoi:10.18112/openneuro.ds005059.v1.0.6

    The archived PAL1 features were derived from the ses-0 signal in OpenNeuro ds005059 v1.0.6; the saved exact-version dataset metadata records CC0.

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