SEEG beta power did not exceed pre-cue rest after cued key presses in eight subjects

We tested for a post-movement beta rebound in stereo-electroencephalography (SEEG) after cued key presses in eight subjects from OpenNeuro ds004473 v1.0.2. On held-out trials (101+), beta power on the eight channels selected for the strongest beta event-related desynchronization did not rise above pre-cue fixation rest 0.5–1.5 s after the press (mean difference −0.014 log units; 3/8 subjects above zero; exact one-sided sign-flip p = 0.68). The movement-related beta decrease was present on the same trials (−0.238; 0/8 above zero; p = 0.0078). Across channels, movement and post-press beta contrasts were positively correlated (mean r = 0.38; 8/8 positive), and 5.7% of channels on average had an FDR-significant beta increase. Linear decoders distinguished post-press from rest (beta AUC 0.64; HG+B AUC 0.65; 8/8 above 0.5; p = 0.0078), while the move-versus-rest decoder did not show a significant increase in false move outputs after the press (POST1 11.5% versus rest 7.6%; difference +3.9 percentage points; 4/8 positive; p = 0.20). The findings are limited by eight subjects, clinically determined electrode coverage, a pre-cue fixation baseline, short key presses, and analysis windows from +0.5 to +1.5 s; they do not exclude a rebound in unsampled cortex, after longer movements, or at other times.

stereo-electroencephalography · beta oscillations · post-movement beta rebound · brain-computer interface · linear decoding · motor activity