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q-bio.NC · Neurons and Cognition

Across 90 SEEG patients, HFA and theta slopes scale with item spacing, rejecting a one-step-per-item model

Across 90 unique patients and 110 task sets from FR1, catFR1, pyFR, and PAL1, we compared serial-position slopes in 70–150 Hz high-frequency activity (HFA) and 3–8 Hz theta across tasks with different item spacing. The PAL1-to-short-spacing slope ratio was 1.83 for HFA (95% CI 1.10–2.78; p = 0.011 for R > 1) and 2.31 for theta (95% CI 1.48–3.29; p = 0.0009). Both results reject the one-step-per-presented-event model (R = 1); neither rejects the elapsed-time prediction (R = 2.33). Per-second slopes had consistent signs across tasks, and heterogeneity was lower in per-second than per-position units. Each PAL1 position presents two words, however, and the word-count prediction (R = 2) lies inside both confidence intervals. The data therefore do not distinguish elapsed time from word count. The within-subject analysis of nine patients was underpowered and inconclusive. Patients, epoch windows, and encoding demands differed across tasks, and comparability of z units depends on equal per-channel scaling across tasks.

serial position · high-frequency activity · theta · SEEG · word encoding · item spacing · elapsed time · memory

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References

6
  1. usesIn 18 patients, SEEG depth-pair 70–150 Hz power decreased and 3–8 Hz power increased with serial position during pyFR free recall sci:sha256:7889fbcc8122c42c15fb9d652f30c0c1bee97571b6103405da3ad277bc820b38

    pyFR per-subject slopes and events are inputs.

  2. usesIn 71 completed OpenNeuro iEEG datasets, 42 contained SEEG channels across 1,167 subjects sci:sha256:79a420e35329acba12ac65e4e29aee4286ecfce55fed09cf0b4967a9658202a9

    SEEG dataset census used to select tasks.

  3. usesIn catFR1, theta increased and HFA decreased across list positions, but the HFA effect was smaller and position 1 dependent sci:sha256:324ee8b2bd39a1a5cec5dbbc57bbd00d5dd720744b70f3e88f4ca47da4c4e4ec

    catFR1 per-subject slopes are an input.

  4. usesPAL1 cued recall shows serial-position changes in SEEG band power without a change in recall sci:sha256:276915e2a2f6a02eba217c75f6bdc0618636803793f9c1dd5092d5690518e312

    PAL1 per-subject slopes and SOA check are inputs; we test the position-versus-time question that it left open.

  5. usesIn 51 pure-SEEG FR1 patients, sample-timed HFA decreased and theta increased with serial position sci:sha256:1da9d2dc0707f4d6cf26a2edf8d7e8f74cdb417581b20b70aafdf258db4aedc8

    FR1 per-subject sample-timed serial-position slopes are an input.

  6. supersedesCross-task slopes reject a one-step-per-event model but do not separate elapsed time from word count sci:sha256:df413dd257c1d332228ec65f3ecb4ad204106267c6efd05519104ebfcbe44c57

    Same analysis; corrects the patient count in the title from 110 (patient-task sets) to 90 unique patients.

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