{ "schema_version": "bci-report-ssvep-followups-update-v1", "release_id": "ssvep-followups-update-20261028", "generated_at": "2026-10-28", "status": "aggregate_preview", "title": "New SSVEP frequencies, cards 8 to 14", "question": "What lets a decoder answer an SSVEP frequency it never trained on?", "placement": { "page": "/topics/new-ssvep-frequencies/", "group": "adapting", "leaderboard": false, "new_page_count": 0, "new_dataset_count": 0, "new_model_count": 0, "card_order": "the order of the consolidated handoff; cards 1 to 8 keep their numbers and anchors", "reads_with": { "release_id": "new-ssvep-frequencies-update-20261020", "file": "new-ssvep-frequencies-update.json", "cards": [ 1, 2, 3, 4, 5, 6, 7 ] }, "cards": [ { "card": 8, "anchor": "cross-spectral", "studies": [ "xspec" ], "endpoints": [ "u8", "seen_ba" ], "supersedes": { "release_id": "new-ssvep-frequencies-update-20261020", "file": "new-ssvep-frequencies-update.json", "entry": "status_only" } }, { "card": 9, "anchor": "eigenvalue-pooling", "studies": [ "coherence_eigen" ], "endpoints": [ "u8", "seen_ba" ] }, { "card": 10, "anchor": "harmonic-pooling", "studies": [ "harmonic_pooling", "harmonic_pooling_wearable" ], "endpoints": [ "u8", "seen_ba", "dry", "wet" ] }, { "card": 11, "anchor": "practical-settings", "studies": [ "practical_settings" ], "endpoints": [ "u8", "seen_ba" ] }, { "card": 12, "anchor": "harmonic-gap", "studies": [ "harmonic_gap" ], "endpoints": [ "u8", "dry", "wet" ] }, { "card": 13, "anchor": "fixed-decay", "studies": [ "fixed_decay" ], "endpoints": [ "u8", "seen_ba", "dry", "wet" ] }, { "card": 14, "anchor": "rising-weights", "studies": [ "rising_weights" ], "endpoints": [ "u8", "seen_ba", "dry", "wet" ] } ] }, "metric_units": "Accuracies, balanced accuracies, decision-change shares, pairwise win fractions and chance levels are proportions in [0,1]. An entry with unit \"difference of proportions\" is a paired difference, stored as a proportion: multiply by 100 for percentage points. Entries with unit \"squared correlation\" or \"difference of squared correlations\" (card 12’s gap G and residual R) are score units and never percentages. CPU component figures are milliseconds. Counts of people, windows, folds, rotations, fits, draws, calls and candidates are whole numbers. \"no training\" or \"deterministic fit\" stands where a trained level gives its seed count; null means not defined or not computed, never zero.", "scope": "Seven audited follow-ups to route 3 on SSVEP frequencies a decoder never trained on, cards 8 to 14 of the page. All seven use the BETA cohort route 3 studied; cards 10, 12, 13 and 14 also report Wearable-102, dry and wet. Card 8 gives the results of the cross-spectral round whose status card the earlier file carries. Each study block is read from its own audited aggregate and carries its own interval method. Seen and held-out results are separate tasks, reported side by side. Every figure compares set-ups on fixed splits.", "endpoints": [ { "id": "u8", "task": "Held-out 8-way", "candidates": 8, "chance": 0.125, "cards": [ 8, 9, 10, 11, 12, 13, 14 ] }, { "id": "seen_ba", "task": "Seen 32-way balanced", "candidates": 32, "chance": 0.03125, "cards": [ 8, 9, 10, 11, 13, 14 ] }, { "id": "wearable_12", "task": "Wearable-102 12-way", "candidates": 12, "chance": 0.08333333333333333, "cards": [ 10, 12, 13, 14 ], "sensors": [ "dry", "wet" ] } ], "interval_methods": [ { "card": 8, "study": "xspec", "method": "paired person bootstrap, percentile interval", "draws": 2000, "seed": 20261015, "level": 0.95 }, { "card": 9, "study": "coherence_eigen", "method": "paired person bootstrap, percentile interval", "draws": 2000, "seed": 20261015, "level": 0.95, "conditional_on": "the fixed training and fold procedure" }, { "card": 10, "study": "harmonic_pooling", "method": "paired person bootstrap, percentile interval", "draws": 2000, "seed": 20261015, "level": 0.95, "paired_across": "arms, with each person’s five rotations kept together" }, { "card": 10, "study": "harmonic_pooling_wearable", "method": "paired person bootstrap, percentile interval", "draws": 2000, "seed": 20261020, "level": 0.95, "conditional_on": "the fixed 35 source heads of each learned arm", "paired_across": "methods and both sensors (one set of draws)" }, { "card": 11, "study": "practical_settings", "method": "paired person bootstrap, percentile interval", "draws": 2000, "seed": 20261015, "level": 0.95, "paired_across": "methods, cells and rotations within each sampled person" }, { "card": 12, "study": "harmonic_gap", "method": "paired person bootstrap, percentile interval", "draws": 20000, "seeds": { "BETA": 20261021, "Wearable-102": 20261022 }, "level": 0.95, "shared_draws": "Wearable-102 dry and wet share one set of person draws", "family": { "comparisons": 9, "adjustment": "Bonferroni", "level": 0.9944444444444445 } }, { "card": 13, "study": "fixed_decay", "method": "paired person bootstrap, percentile interval", "draws": 20000, "seeds": { "BETA": 2026102201, "Wearable-102": 2026102202 }, "level": 0.95, "shared_draws": "Wearable-102 dry and wet share one set of person draws", "equivalence": { "level": 0.9, "margin": 0.005 } }, { "card": 14, "study": "rising_weights", "method": "paired person bootstrap, percentile interval", "draws": 20000, "seeds": { "BETA": 2026102501, "Wearable-102": 2026102502 }, "level": 0.95, "shared_draws": "Wearable-102 dry and wet share one set of person draws" } ], "interval_adjustment": { "adjusted": [ { "card": 12, "study": "harmonic_gap", "applies_to": "the primary family", "adjustment": "Bonferroni", "comparisons": 9, "level": 0.9944444444444445 }, { "card": 13, "study": "fixed_decay", "applies_to": "the prespecified margin test of the primary contrast", "level": 0.9, "margin": 0.005 } ], "other_intervals_adjusted": false }, "name_key": [ { "site_name": "harmonic sum (no training)", "export_codes": "RAW-HARM-SUM, RAW-HARM-SUM-H3, S, H3-FLAT, flat", "codes": [ { "study": "coherence_eigen", "code": "RAW-HARM-SUM" }, { "study": "harmonic_pooling", "code": "RAW-HARM-SUM" }, { "study": "harmonic_pooling_wearable", "code": "RAW-HARM-SUM" }, { "study": "practical_settings", "code": "RAW-HARM-SUM-H3" }, { "study": "harmonic_gap", "code": "S" }, { "study": "fixed_decay", "code": "H3-FLAT" }, { "study": "rising_weights", "code": "flat" } ], "key": "new", "note": "S in the harmonic-gap export, H3-FLAT in the fixed-decay export, flat in the rising-weight export: one set of scores" }, { "site_name": "joint CCA", "export_codes": "JOINT-TOP, J", "codes": [ { "study": "coherence_eigen", "code": "JOINT-TOP" }, { "study": "harmonic_gap", "code": "J" } ], "key": "new", "note": "J in the harmonic-gap export: the same scores as CCA-RAW", "alias_of": [ "CCA (no training)", "matched CCA" ] }, { "site_name": "common-direction sum", "export_codes": "B", "codes": [ { "study": "harmonic_gap", "code": "B" } ], "key": "new" }, { "site_name": "eigenvalue head", "export_codes": "EIG-RAW, EIG-RAW6-RIDGE", "codes": [ { "study": "coherence_eigen", "code": "EIG-RAW" }, { "study": "harmonic_pooling", "code": "EIG-RAW" }, { "study": "harmonic_pooling_wearable", "code": "EIG-RAW" }, { "study": "practical_settings", "code": "EIG-RAW6-RIDGE" } ], "key": "new" }, { "site_name": "joint eigenvalue head", "export_codes": "EIG-JOINT", "codes": [ { "study": "coherence_eigen", "code": "EIG-JOINT" }, { "study": "harmonic_pooling", "code": "EIG-JOINT" }, { "study": "harmonic_pooling_wearable", "code": "EIG-JOINT" } ], "key": "new" }, { "site_name": "spectral eigenvalue head", "export_codes": "EIG-SPEC", "codes": [ { "study": "coherence_eigen", "code": "EIG-SPEC" } ], "key": "new" }, { "site_name": "spectral harmonic sum (no training)", "export_codes": "SPEC-HARM-SUM", "codes": [ { "study": "coherence_eigen", "code": "SPEC-HARM-SUM" } ], "key": "new" }, { "site_name": "coherence head", "export_codes": "COH-ABS", "codes": [ { "study": "coherence_eigen", "code": "COH-ABS" } ], "key": "new" }, { "site_name": "signed coherence head", "export_codes": "COH-SIGNED", "codes": [ { "study": "coherence_eigen", "code": "COH-SIGNED" } ], "key": "new" }, { "site_name": "top-three ridge", "export_codes": "RAW-LEAD3-RIDGE", "codes": [ { "study": "harmonic_pooling", "code": "RAW-LEAD3-RIDGE" }, { "study": "harmonic_pooling_wearable", "code": "RAW-LEAD3-RIDGE" }, { "study": "practical_settings", "code": "RAW-LEAD3-RIDGE" } ], "key": "new" }, { "site_name": "harmonic max (no training)", "export_codes": "RAW-HARM-MAX", "codes": [ { "study": "harmonic_pooling", "code": "RAW-HARM-MAX" }, { "study": "harmonic_pooling_wearable", "code": "RAW-HARM-MAX" } ], "key": "new" }, { "site_name": "all-component sum (no training)", "export_codes": "RAW-HARM-ALLSUM", "codes": [ { "study": "harmonic_pooling", "code": "RAW-HARM-ALLSUM" }, { "study": "harmonic_pooling_wearable", "code": "RAW-HARM-ALLSUM" } ], "key": "new" }, { "site_name": "joint all-component sum (no training)", "export_codes": "JOINT-ALLSUM", "codes": [ { "study": "harmonic_pooling", "code": "JOINT-ALLSUM" }, { "study": "harmonic_pooling_wearable", "code": "JOINT-ALLSUM" } ], "key": "new" }, { "site_name": "cross-spectral ridge", "export_codes": "XS-RIDGE", "codes": [ { "study": "xspec", "code": "XS-RIDGE" }, { "study": "coherence_eigen", "code": "XS-RIDGE" } ], "key": "new" }, { "site_name": "whitened cross-spectral ridge", "export_codes": "XS-RIDGE-W", "codes": [ { "study": "xspec", "code": "XS-RIDGE-W" }, { "study": "coherence_eigen", "code": "XS-RIDGE-W" } ], "key": "new" }, { "site_name": "cross-spectral ridge with quadrature", "export_codes": "XS-RIDGE-Q", "codes": [ { "study": "xspec", "code": "XS-RIDGE-Q" }, { "study": "coherence_eigen", "code": "XS-RIDGE-Q" } ], "key": "new" }, { "site_name": "cross-spectral MLP", "export_codes": "XS-MLP", "codes": [ { "study": "xspec", "code": "XS-MLP" } ], "key": "new" }, { "site_name": "filter-bank CCA (seven sub-bands)", "export_codes": "FBCCA-M3-N7-H5, FBCCA-DECAY", "codes": [ { "study": "practical_settings", "code": "FBCCA-M3-N7-H5" }, { "study": "fixed_decay", "code": "FBCCA-DECAY" } ], "key": "new", "note": "FBCCA-DECAY in the fixed-decay export: the same scores as FBCCA-M3-N7-H5 at 2 s and 8 electrodes" }, { "site_name": "CCA (no training)", "export_codes": "CCA-RAW, CCA-RAW-H3", "codes": [ { "study": "xspec", "code": "CCA-RAW" }, { "study": "coherence_eigen", "code": "CCA-RAW" }, { "study": "harmonic_pooling", "code": "CCA-RAW" }, { "study": "practical_settings", "code": "CCA-RAW-H3" } ], "key": "released", "note": "CCA-RAW-H3 in the practical B/D export: the same scores as CCA-RAW at 2 s and 8 electrodes" }, { "site_name": "cropped-spectrum match (no training)", "export_codes": "SUBSPACE-CROP", "codes": [ { "study": "xspec", "code": "SUBSPACE-CROP" } ], "key": "released" }, { "site_name": "channel-energy average", "export_codes": "CHANNEL-HARMONIC", "codes": [ { "study": "xspec", "code": "CHANNEL-HARMONIC" } ], "key": "released" }, { "site_name": "shared ridge scorer", "export_codes": "SHARED-RIDGE", "codes": [ { "study": "xspec", "code": "SHARED-RIDGE" }, { "study": "coherence_eigen", "code": "SHARED-RIDGE" } ], "key": "released" }, { "site_name": "matched CCA", "export_codes": "CCA-RAW", "codes": [ { "study": "harmonic_pooling_wearable", "code": "CCA-RAW" } ], "key": "released" }, { "site_name": "joint CCA plus gap (diagnostic score)", "export_codes": "JplusG", "codes": [ { "study": "harmonic_gap", "code": "JplusG" } ], "key": "card" }, { "site_name": "harmonic sum with decay weights (no training)", "export_codes": "H3-DECAY", "codes": [ { "study": "fixed_decay", "code": "H3-DECAY" } ], "key": "card" }, { "site_name": "filter-bank CCA with flat sub-band weights (no training)", "export_codes": "FBCCA-FLAT", "codes": [ { "study": "fixed_decay", "code": "FBCCA-FLAT" } ], "key": "card" }, { "site_name": "rising weights 1, 1.5, 1.9 (no 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], "w250-c4/CCA-RAW-H3 minus w250-c8/CCA-RAW-H3/u8": [ "recorded_subset_not_headset" ], "w250-c4/RAW-HARM-SUM-H3 minus w250-c8/RAW-HARM-SUM-H3/u8": [ "recorded_subset_not_headset" ], "w250-c4/RAW-LEAD3-RIDGE minus w250-c8/RAW-LEAD3-RIDGE/u8": [ "recorded_subset_not_headset" ], "w250-c4/EIG-RAW6-RIDGE minus w250-c8/EIG-RAW6-RIDGE/u8": [ "recorded_subset_not_headset" ], "w250-c4/FBCCA-M3-N7-H5 minus w250-c8/FBCCA-M3-N7-H5/u8": [ "recorded_subset_not_headset" ] }, "qualifiers": { "eight_electrodes_not_always_better": { "cells": [ "w125-c4", "w125-c8" ], "endpoint": "u8", "methods_four_above_eight": [ "RAW-HARM-SUM-H3", "RAW-LEAD3-RIDGE", "EIG-RAW6-RIDGE" ], "paired_interval": null, "basis": "level means; no paired interval was registered for these pairs", "limitation_key": "eight_not_always_better" } }, "reproduces": [ { "here": "w500-c8/CCA-RAW-H3/u8", "card": 10, "study": "harmonic_pooling", "there": "CCA-RAW/u8" }, { "here": "w500-c8/CCA-RAW-H3/u8", "card": 5, "study": 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Participant consent described use for non-commercial scientific research, a narrower operational boundary than the copyright license; minors required parental consent.", "Cohort aggregates only; no participant records, EEG signals, or individual predictions." ], "cards": [ 8, 9, 10, 11, 12, 13, 14 ], "published_here": "Cohort aggregates over the 70 people for cards 8 to 14: levels and paired contrasts with their intervals, gap statistics in squared-correlation units, decision-change shares and check counts; and CPU component medians measured on BETA windows. No per-person, per-fold, per-rotation, per-window or per-frequency value." }, "wearable_102": { "name": "Wearable-102", "title": "An Open Dataset for Wearable SSVEP-Based Brain-Computer Interfaces", "paper_citation": "Zhu, F., Jiang, L., Dong, G., Gao, X., & Wang, Y. (2021). An Open Dataset for Wearable SSVEP-Based Brain-Computer Interfaces. 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