Early-delay gamma power was lower on full-recall trials in 12 SEEG patients
In a load-3 object working-memory task, we analyzed preprocessed bipolar SEEG from 13 patients (143 middle frontal and middle temporal channels) in four 800-ms windows. For 12 patients with sufficient full (3/3) and partial (≤2/3) recall trials, early-delay 50–100 Hz power was lower on full-recall trials (mean per-subject AUC 0.473, 95% CI 0.461–0.486; sign-flip p=0.0029; Holm-adjusted p=0.023 across eight primary delay tests). The association was strongest in middle temporal channels (AUC 0.459, p=0.0015); the middle frontal result was not significant. Fixation gamma did not predict recall (AUC 0.495, p=0.48), while the fixation-corrected early-delay measure remained associated (AUC 0.481, p=0.009). No other primary test passed Holm correction. Higher encoding theta was associated with full recall in an exploratory test (AUC 0.544, p=0.005). Mean task modulation was small; the complete archived test results are in the main text. The effect is small and based on 12 patients. There was no EOG or aperiodic correction; the dataset authors preprocessed the data and rejected trials, and this analysis did not inspect raw data. The task used one load level, burst rates were not computed, and channel locations are available only as gyrus labels. This is an independent trial-level power and behavior analysis, not a replication of the source paper’s burst results.
working memory · intracranial EEG · SEEG · gamma power · recall · memory · temporal lobe · middle temporal gyrus · middle frontal gyrus · OpenNeuro · AUC · trial-level analysis
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- supportsIn 13 SEEG patients, gamma bursts did not increase during encoding or late delay, while beta bursts decreased in middle frontal gyrus
Same dataset. Encoding 65-100 Hz burst occupancy is lower (not higher) on full-recall trials. This agrees in direction with the lower early-delay 50-100 Hz power on full-recall trials in that work (exploratory, not significant here).
- Early-delay 50–100 Hz power remains lower on full-recall trials after trial-position control in 12 SEEG patients
[Legacy relation: reproduces] We calculate the raw early-delay gamma AUC again with the same data and method. We get the same value (0.473, CI 0.461-0.485).
- supportsEarly-delay 50–100 Hz power remains lower on full-recall trials after trial-position control in 12 SEEG patients
The effect stays after control for trial position (adjusted AUC 0.473, stratified AUC 0.478, both Holm p < 0.01). Thus time-in-session drift does not explain it.
- challengesFull recall tracks a steeper aperiodic exponent during encoding in 12 OWM SEEG patients
Most of its encoding theta recall effect comes from a change of the aperiodic exponent, not only from narrowband theta.
- usesFull recall tracks a steeper aperiodic exponent during encoding in 12 OWM SEEG patients
We use its EDF reader, its versioned URL list and its encoding window. We test its exploratory encoding theta recall effect and reproduce the raw value.
- usesDelay frontal–temporal theta consistency tracked full recall, but did not rise above fixation, in 10 SEEG patients
We used its versioned OpenNeuro ds006136 v1.0.1 file URL list, its SHA-256 hash list, its numpy-only EDF reader and its task window definitions. These let us download, check and read the same SEEG data without MNE.
- In ds006136 SEEG, aperiodic detrending leaves no 50–100 Hz recall effect; broadband power change remains undetermined
[Legacy relation: reproduces] Reproduces its DEL1 50-100 Hz recall effect with the same data and windows (AUC 0.473, p = 0.0024). It also answers its stated limit (no aperiodic model): no narrowband part remains after aperiodic removal.
- usesIn ds006136 SEEG, aperiodic detrending leaves no 50–100 Hz recall effect; broadband power change remains undetermined
Uses its EDF loader, trial and recall definitions, AUC and sign-flip statistics, versioned URL list and SHA-256 hashes.
- usesCortical SEEG shows theta–gamma coupling without delay enhancement or recall differences
Same dataset, same delay period and same full-recall definition. We test phase-amplitude coupling, not band power.
- usesIn ds006136 SEEG, slow encoding evoked-potential gain did not predict full recall (12 patients; AUC 0.515, 95% CI 0.498–0.532; p = 0.13)
We use the same dataset, the same full-recall versus partial-recall definition, and the same fixation-control logic. This result adds the evoked-potential measure.
- supportsRecall failures clustered in trials, while SEEG power tracked object recall count
We also find lower 50-100 Hz power 0.2-1.0 s into the delay with better recall. We show that this relation is graded with the number of recalled objects and that it stays when full-recall trials are removed.
- usesThe SEEG aperiodic exponent does not change significantly from fixation to encoding or early delay in 9 ds006136 patients (MFG/MTG bipolar channels, 800 ms windows, 30-48 Hz fit)
We reuse its ds006136 EDF loader and its FIX/ENC/DEL1/DEL2 task windows.
- usesThe ds006136 SEEG evoked response is present but does not predict full recall
That work found a spectral (50-100 Hz) recall effect in the same data with the same full-recall label; this work tests the time-domain evoked response as a different predictor.