# eTRCA: results on public EEG datasets

Methods

Ensemble task-related component analysis (ensemble TRCA) is an SSVEP detection method proposed by Nakanishi et al. (IEEE Transactions on Biomedical Engineering, 2018). TRCA learns spatial filters that maximize the reproducibility of time-locked responses across calibration trials; the ensemble version combines the filters learned for every stimulus frequency and correlates a filtered test trial with each class's averaged calibration template.

**Also known as** ensemble TRCA · ensemble task-related component analysis · TRCA · task-related component analysis · TRCA-SSVEP · Nakanishi et al. 2018

**Reference** [Nakanishi M, Wang Y, Chen X, Wang Y-T, Gao X, Jung T-P. Enhancing detection of SSVEPs for a high-speed brain speller using task-related component analysis. IEEE Transactions on Biomedical Engineering 65(1):104–112, 2018. ↗](https://doi.org/10.1109/TBME.2017.2694818)

[Official code ↗](https://github.com/mnakanishi/TRCA-SSVEP) · Description sources [pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/28436836/) · [pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/PMC5783827/) · [doi.org](https://doi.org/10.1109/TBME.2017.2694818) · [github.com](https://github.com/mnakanishi/TRCA-SSVEP) · [github.com](https://github.com/mnakanishi/TRCA-SSVEP/blob/master/README.md)

## Published results

Grouped by dataset. Compare figures within a group only: across groups the task, cohort, chance level and electrode layout all change.

### [Wearable SSVEP BCI dataset (dry and wet electrodes)](https://bci.report/datasets/wearable-ssvep-102/) · Calibration budget · eTRCA and CCA

Read with its protocol: [How much calibration?](https://bci.report/topics/calibration-budget/) · [deployment-topics.json](https://bci.report/data/deployment-topics.json)

**Balanced accuracy, 4 configurations.** Dot: the estimate; line: 95% interval; dashed line: chance level where the payload records one.

- Single-band eTRCA · 24 calibration trials · dry: 12.4% (10.4%–15.0%)
- Single-band eTRCA · 24 calibration trials · wet: 39.8% (34.1%–45.8%)
- Single-band eTRCA · 48 calibration trials · dry: 15.1% (12.6%–18.2%)
- Single-band eTRCA · 48 calibration trials · wet: 64.0% (57.1%–70.7%)

| Method | Condition | Metric | Value | People |
| --- | --- | --- | --- | --- |
| [Single-band eTRCA](https://bci.report/methods/etrca/) | 24 calibration trials · dry | Balanced accuracy | 12.4% (10.4%–15.0%) | 102 |
| [Single-band eTRCA](https://bci.report/methods/etrca/) | 24 calibration trials · wet | Balanced accuracy | 39.8% (34.1%–45.8%) | 102 |
| [Single-band eTRCA](https://bci.report/methods/etrca/) | 48 calibration trials · dry | Balanced accuracy | 15.1% (12.6%–18.2%) | 102 |
| [Single-band eTRCA](https://bci.report/methods/etrca/) | 48 calibration trials · wet | Balanced accuracy | 64.0% (57.1%–70.7%) | 102 |

[All methods →](https://bci.report/methods/) · [All datasets →](https://bci.report/datasets/)

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Markdown copy of https://bci.report/methods/etrca/, generated from the published page. Figures are aggregate results; terms of use: https://bci.report/data-use/