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Erschienen in: Medical & Biological Engineering & Computing 3/2021

16.02.2021 | Original Article

EEG-based hybrid QWERTY mental speller with high information transfer rate

verfasst von: Er. Akshay Katyal, Rajesh Singla

Erschienen in: Medical & Biological Engineering & Computing | Ausgabe 3/2021

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Abstract

Background

Brain-computer interface (BCI) spellers detect variations in brain waves to help subjects communicate with the world. This study introduces a P300-SSVEP hybrid BCI-based QWERTY speller.

Methods

The proposed hybrid speller, combines SSVEP and P300 features using a hybrid paradigm. P300 was used as time division multiplexing index which results in the use of lesser number of assumed frequencies for SSVEP elicitation. Each flickering frequency was also assigned a unique colour, to enhance system accuracy.

Results

On the basis of 20 subjects, an average accuracy of classification of 96.42% and a mean information transfer rate (ITR) of 131.0 bits per min. (BPM) was achieved during the free spelling trial (trial-F).

Comparison

The t test results revealed that the hybrid QWERTY speller performed significantly better (on the basis of mean classification accuracy and ITR) as compared to the traditional P300 speller) and the QWERTY SSVEP speller. Also, the amount of time taken to spell a word was significantly lesser in the case of hybrid QWERTY speller in contrast to traditional P300 speller while it was almost the same as compared to QWERTY SSVEP speller.

Conclusion

QWERTY speller outperformed the stereotypical P300 speller as well as QWERTY SSVEP speller.

Graphical abstract

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Metadaten
Titel
EEG-based hybrid QWERTY mental speller with high information transfer rate
verfasst von
Er. Akshay Katyal
Rajesh Singla
Publikationsdatum
16.02.2021
Verlag
Springer Berlin Heidelberg
Erschienen in
Medical & Biological Engineering & Computing / Ausgabe 3/2021
Print ISSN: 0140-0118
Elektronische ISSN: 1741-0444
DOI
https://doi.org/10.1007/s11517-020-02310-w

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