{ "schema_version": "bci-report-electrode-shift-update-v1", "release_id": "electrode-shift-update-20261106", "generated_at": "2026-11-06", "status": "aggregate_preview", "question": "What if the cap sits one electrode off?", "placement": { "page": "/topics/fewer-electrodes/", "section": "cap-shift", "after": "v9-montage", "before": "methods-and-limits", "leaderboard": false, "core_matrix": false, "dataset_page": false, "new_dataset_count": 0, "new_model_count": 0, "transfer_map": { "row": "sensor", "state": "measured", "key": "sensor:cap-shift", "comparison": false, "with": null } }, "metric_units": { "accuracy_pct": "percent of trials correct; cohort mean of per-person accuracy over 160 trials (EEGNet over 480, its three training seeds pooled)", "mean_pp": "percentage points, shifted minus original, paired by person" }, "interval_method": "participant bootstrap, 100,000 draws", "cohort": { "dataset": "BETA", "people": 70, "blocks": 4, "trials_per_person": 160, "trials": 11200, "targets": 40, "frequency_range_hz": [ 8.0, 15.8 ], "chance_pct": 2.5, "window_s": 2, "secondary_window_s": 1, "sampling_hz": 250, "decoding_sites": [ "PO5", "PO3", "POZ", "PO4", "PO6", "O1", "OZ", "O2" ] }, "decoders": [ { "id": "cca", "name": "CCA", "training": "none", "detail": "joint CCA, three harmonics, 6–80 Hz window filter", "method_page": "/methods/cca/" }, { "id": "fbcca", "name": "Filter-bank CCA", "training": "none", "detail": "seven sub-bands, five harmonics, weights n^−1.25 + 0.25", "method_page": "/methods/fbcca/" }, { "id": "etrca", "name": "eTRCA", "training": "per person, leave one block out (three training trials per target)", "detail": "ensemble TRCA (Nakanishi et al. 2018) on the same seven-band filter bank", "method_page": "/methods/etrca/" }, { "id": "ridge", "name": "Spectral ridge", "training": "across people, seven participant folds", "detail": "log power at three harmonics of the 40 targets per channel; ridge, alpha 100" }, { "id": "eegnet", "name": "EEGNet", "training": "across people, seven participant folds, from scratch; three training seeds averaged", "method_page": "/methods/eegnet/" }, { "id": "cbramod", "name": "CBraMod", "training": "frozen encoder, ridge readout across people, seven participant folds", "method_page": "/methods/cbramod/", "code_licence": "MIT", "weights_licence": "Apache-2.0", "weights_licence_source": "official model card", "weights_distributed": false } ], "variants": { "deployed": "fitted at the original positions and tested on the shifted cap", "recalibrated": "fitted and tested on the shifted cap; the shift is known in advance" }, "neighbour_maps": [ { "id": "NB-FORWARD-1", "shift": "forward one row", "reads": [ "P3", "P1", "PZ", "P2", "P4", "PO3", "POZ", "PO4" ], "sites_kept": 3, "kept": [ "PO3", "POZ", "PO4" ], "swapped_in": [ "P3", "P1", "PZ", "P2", "P4" ], "swapped_out": [ "PO5", "PO6", "O1", "OZ", "O2" ], "read_site_displacement_cm": { "min": 2.7, "max": 4.0, "mean": 3.48 }, "max_off_rotation_cm": 0.92 }, { "id": "NB-LEFT-1", "shift": "left one column", "reads": [ "P5", "PO5", "PO3", "POZ", "O2", "PO7", "O1", "OZ" ], "sites_kept": 6, "kept": [ "PO5", "PO3", "POZ", "O1", "OZ", "O2" ], "swapped_in": [ "P5", "PO7" ], "swapped_out": [ "PO4", "PO6" ], "read_site_displacement_cm": { "min": 1.8, "max": 3.5, "mean": 2.82 }, "max_off_rotation_cm": 1.97 }, { "id": "NB-RIGHT-1", "shift": "right one column", "reads": [ "O1", "POZ", "PO4", "PO6", "P6", "OZ", "O2", "PO8" ], "sites_kept": 6, "kept": [ "POZ", "PO4", "PO6", "O1", "OZ", "O2" ], "swapped_in": [ "P6", "PO8" ], "swapped_out": [ "PO5", "PO3" ], "read_site_displacement_cm": { "min": 1.8, "max": 3.5, "mean": 2.82 }, "max_off_rotation_cm": 1.97 } ], "rotation": { "forward": { "degrees": 22.8, "mean_site_move_cm": 3.31 }, "sideways": { "degrees": 17.9, "mean_site_move_cm": 2.73 } }, "spline": { "method": "Perrin spherical splines, order 4, 50 Legendre terms, exact interpolation from the 60 cap sites with coordinates", "doses_cm": [ 1, 2, 3 ] }, "statistics": { "unit": "participant", "bootstrap": { "draws": 100000, "seed": 20261104, "interval": "percentile", "same_draws_every_contrast": true, "conditional_on_fitted_models": true }, "primary": { "family_size": 12, "interval_level": 0.9958333333333333, "correction": "Bonferroni over the 12" }, "secondary": { "contrasts": 132, "interval_level": 0.95, "familywise_claim": false }, "practical_band_pp": 2.0, "direction_rule": "interval wholly below 0: lower; wholly above: higher; otherwise unresolved" }, "contrast_families": { "P": "primary: shifted minus original accuracy, decoders fitted at the original positions, 2-second window", "S1-drop": "shifted minus original accuracy, fitted at the original positions, for spectral ridge and CBraMod", "S2-mismatch": "fitted at the original positions minus recalibrated on the shifted cap, both on the shifted cap", "S3-refit-loss": "recalibrated on the shifted cap minus original accuracy: the loss that remains after refitting", "S4-spline": 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Figshare 12264401 v3; mirror Bingchuan/BETA.", "license": "CC BY 4.0", "licenseUrl": "https://creativecommons.org/licenses/by/4.0/", "consent_use": "participant consent described non-commercial scientific research", "repository": "Bingchuan/BETA", "revision": "d4290c0200db8a104e0f557349dc49f90ba79506", "reused_record": "the released BETA rights record" }, "cbramod": { "code": "MIT", "weights": "Apache-2.0 (official model card)", "distributed": false }, "methods": [ "Nakanishi et al. 2018 (ensemble TRCA)", "Chen et al. 2015, doi:10.1088/1741-2560/12/4/046008 (filter-bank CCA)" ] }, "caveats": [ { "id": "rigid-shift", "text": "The simulation moves the whole cap as one piece with the reference fixed; a real slip can be partial, change contact and impedance, and move the reference too. Backward slips and slides toward one ear are not simulated." }, { "id": "template-positions", "text": "BETA gives template positions, so each person’s true displacement is unknown. The neighbour maps move the read sites a mean of 3.48 cm forward and 2.82 cm sideways and keep 3 and 6 of the eight original sites, so the directions are not compared with each other." }, { "id": "conditional-intervals", "text": "Intervals resample people with the fitted models held fixed; the variance of training is not included." }, { "id": "one-dataset", "text": "One dataset and offline 40-target classification, with no latency or online ITR measured; nothing follows about any headset." }, { "id": "baselines", "text": "The decoders start from very different accuracies, so a change in points is read beside its baseline." }, { "id": "interpolation", "text": "An interpolated site is a weighted mix of recorded sites, so for decoders fitted to positions the spline doses mix displacement with interpolation and are indicative only." }, { "id": "recalibration-known-shift", "text": "Recalibration uses the person’s own shifted trials (eTRCA) or other people recorded with the same shift (ridge, EEGNet, CBraMod); both assume the shift is known in advance, so they show what was lost, not a practical fix." } ], "how_checked": [ { "id": "prespecified", "state": "pass", "text": "The decoders, shifts, windows and contrasts were prespecified and independently reviewed before any shifted score existed." }, { "id": "freeze", "state": "pass", "text": "The protocol, the spatial operators and every code file were frozen by SHA-256 before the shifted runs, and the bridges to the published cells passed first." }, { "id": "audit", "state": "pass", "text": "A read-only independent audit recomputed from the sealed predictions every person’s accuracy, the twelve primary intervals and the counts of people losing or gaining 10 points or more (in whole trials), and repeated the channel check.", "max_abs_interval_difference_pp": 3.552713678800501e-15, "checks_passed": 263, "checks": 263 }, { "id": "interpretation", "state": "pass", "text": "An independent reader who had no part in the study checked the interpretation of the results against the records before publication." } ], "not_published": [ "Per-person, per-fold, per-window and per-seed values, including EEGNet’s per-seed means and any spread across seeds.", "Participant identifiers, and which channel was flagged for whom.", "Predictions, scores, fitted models and the sealed files.", "Counts of people for a 5-point change, and medians.", "Intervals for the analysis without the three flagged people.", "The 1-s spline results.", "Accuracies of the interpolated (spline) arms and of the shifted 1-s arms as levels; they enter only through contrasts: minus the original cap, minus the neighbour map at the same angle (the spline steps), or deployed minus recalibrated (1-s eTRCA).", "Storage locations, hosts, compute times and the research records themselves (pinned by SHA-256 in the manifest)." ], "release_record": { "date": "2026-11-06", "decision": "D38", "rights": "BETA keeps its released record: CC BY 4.0, cohort aggregates only, with participant consent described for noncommercial scientific research. CBraMod: code MIT, weights Apache-2.0 as its official model card states; no weights are distributed. 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