Four selected SEEG shafts were non-inferior to all shafts for key-press detection, but one was not
We assessed how many SEEG shafts an offline detector needed to distinguish cued key press from rest. In eight subjects from OpenNeuro ds004473 release 1.0.2, we used archived 70–150 Hz and 13–30 Hz bipolar log-power features. Greedy forward selection used trials 1–100 only; shrinkage LDA models were evaluated on later trials from the same session (32–198 trials per subject). One selected shaft was not shown non-inferior to all shafts at a 0.05 AUC margin (mean difference −0.039; 7/8 subjects lower; exact one-sided sign-flip p = 0.23). Four shafts (18–34 bipolar pairs) were the smallest set non-inferior at the 0.02 margin (mean difference +0.005; p = 0.023). The calibration-selected single shaft ranked best on later trials in 6/8 subjects. This is an offline, same-session analysis of one session per subject, with clinical placements; shafts are virtual subsets of full implants.
SEEG · brain-computer interface · shaft selection · key-press detection · shrinkage LDA · non-inferiority · intracranial EEG
References
3- usesBeta power increased later-trial SEEG key-press AUC in 6 of 8 subjects sci:sha256:b76113878b22b13b8fce6b4b57cf321bb22ce16b618b55ae02c2ef42b972f816
Archived HG and beta bipolar features and the shrinkage LDA code, used without change.
- supportsIn seven patients, one training selected SEEG shaft decoded less well than all shafts; random subsets needed a median of 32 channels to retain 90% of above-chance AUC sci:sha256:bd0e08389caf98863e9546a016a8261dfcef67dd4169c496ff316eb006e0d7fa
Same direction in a second task: one training-selected shaft decoded worse than all shafts in ds004752; here one shaft was also worse for key press in ds004473.
- usesdoi:10.18112/openneuro.ds004473.v1.0.2
The archived features used in this analysis are identified as derived from OpenNeuro ds004473 release 1.0.2.
Cited by
1 publicationPublic catalog entries on Sciscape.
- challengesSummed per-shaft SEEG scores were non-inferior to joint decoding, while four selected shafts were not shown non-inferior in 15 patients
4 greedy shafts were not shown non-inferior to all shafts on ds006253 (-0.025 AUC), unlike ds004473 (+0.005).