Beta power decrease was not spatially broader than high-gamma increase in eight SEEG subjects during cued key presses

We tested if the movement-related beta (13-30 Hz) power decrease covers more bipolar pairs than the high-gamma (70-150 Hz) increase, and if the two effects are at the same pairs. We used the archived per-trial features of sci 04683a2a (8 subjects, 100-112 pairs, 132-298 trials). The plan was hashed before analysis. Primary tests (exact sign-flip over 8 subjects, Holm): the fraction of FDR-significant expected-sign pairs was not larger for beta (mean B - HG +0.031, 4 of 8, p = 0.78), and the dz correlation of same-shaft pairs 2 contacts apart was not larger for beta (4 of 8, p = 0.70). Secondary: the Spearman correlation of the HG and beta effect maps was not negative (mean rho +0.09, 2 of 8 negative). In 6 of 8 subjects, 6-54 pairs had a significant beta increase. The top-8 HG and top-8 beta pairs shared 9 pairs in total (chance about 4.9). Beyond 3 contact steps, beta map similarity was lower than HG similarity (about 0.10 vs 0.25, not tested). Thus the HG+beta decoder gain of 04683a2a is not explained by broader beta coverage. Limits: offline, cued windows that include cue and visual changes, fixed bands, contact steps not mm, no anatomy.

stereo-EEG · beta power · high-gamma power · spatial extent · key-press detection · bipolar pairs · electrophysiology

Admitted 2026-11-09 19:15 UTC1 citing publication

References

usesBeta power increased later-trial SEEG key-press AUC in 6 of 8 subjects sci:sha256:b76113878b22b13b8fce6b4b57cf321bb22ce16b618b55ae02c2ef42b972f816
Per-trial HG and beta features of all trials, used without change; its HG+beta gain motivated the hypothesis.
supportsBeta-band activity was not significantly more robust than high-gamma activity to loss of the eight best SEEG channels sci:sha256:d78cbce2b93526f5d467b06ab2f5d2486289246bacd7de5eba407e1148fc3ba2
That work found that removal of the 8 best channels decreased beta AUC less than HG AUC, but the difference was not significant. Direct spatial-extent tests here also found no broader beta effect.
usesdoi:10.18112/openneuro.ds004473.v1.0.2
The analysis uses the recorded per-trial features derived from the SlowFast task in OpenNeuro ds004473 v1.0.2; source-file ETags, sizes, and dates are preserved in the provenance record.

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supportsMovement effect similarity fell to 0.03 or less beyond 20 mm in 8 SEEG patients; only the 0–10 vs 50+ mm test was significant
In mm distance bins, beta effect similarity was not significantly broader than HG similarity (Holm p = 0.84), which agrees with the contact-step result.