The cost of space independence in P300-BCI spellers

Srivas Chennu; Abdulmajeed Alsufyani; Marco Filetti; Adrian M Owen; Howard Bowman

doi:10.1186/1743-0003-10-82

The cost of space independence in P300-BCI spellers

Srivas Chennu, Abdulmajeed Alsufyani, Marco Filetti, Adrian M Owen, Howard Bowman

Psychology

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

189 Downloads (Pure)

Abstract

BACKGROUND: Though non-invasive EEG-based Brain Computer Interfaces (BCI) have been researched extensively over the last two decades, most designs require control of spatial attention and/or gaze on the part of the user.

METHODS: In healthy adults, we compared the offline performance of a space-independent P300-based BCI for spelling words using Rapid Serial Visual Presentation (RSVP), to the well-known space-dependent Matrix P300 speller.

RESULTS: EEG classifiability with the RSVP speller was as good as with the Matrix speller. While the Matrix speller's performance was significantly reliant on early, gaze-dependent Visual Evoked Potentials (VEPs), the RSVP speller depended only on the space-independent P300b. However, there was a cost to true spatial independence: the RSVP speller was less efficient in terms of spelling speed.

CONCLUSIONS: The advantage of space independence in the RSVP speller was concomitant with a marked reduction in spelling efficiency. Nevertheless, with key improvements to the RSVP design, truly space-independent BCIs could approach efficiencies on par with the Matrix speller. With sufficiently high letter spelling rates fused with predictive language modelling, they would be viable for potential applications with patients unable to direct overt visual gaze or covert attentional focus.

Original language	English
Journal	Journal of neuroengineering and rehabilitation
Volume	10
Issue number	82
DOIs	https://doi.org/10.1186/1743-0003-10-82
Publication status	Published - 29 Jul 2013

Keywords

Brain-Computer Interfaces
Electroencephalography
Evoked Potentials
Humans

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10.1186/1743-0003-10-82

CHENNU_et_al_The_cost_of_space_J_Neuroeng_Rehabil
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Final published version, 1.63 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

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title = "The cost of space independence in P300-BCI spellers",

abstract = "BACKGROUND: Though non-invasive EEG-based Brain Computer Interfaces (BCI) have been researched extensively over the last two decades, most designs require control of spatial attention and/or gaze on the part of the user.METHODS: In healthy adults, we compared the offline performance of a space-independent P300-based BCI for spelling words using Rapid Serial Visual Presentation (RSVP), to the well-known space-dependent Matrix P300 speller.RESULTS: EEG classifiability with the RSVP speller was as good as with the Matrix speller. While the Matrix speller's performance was significantly reliant on early, gaze-dependent Visual Evoked Potentials (VEPs), the RSVP speller depended only on the space-independent P300b. However, there was a cost to true spatial independence: the RSVP speller was less efficient in terms of spelling speed.CONCLUSIONS: The advantage of space independence in the RSVP speller was concomitant with a marked reduction in spelling efficiency. Nevertheless, with key improvements to the RSVP design, truly space-independent BCIs could approach efficiencies on par with the Matrix speller. With sufficiently high letter spelling rates fused with predictive language modelling, they would be viable for potential applications with patients unable to direct overt visual gaze or covert attentional focus.",

keywords = "Brain-Computer Interfaces, Electroencephalography, Evoked Potentials, Humans",

author = "Srivas Chennu and Abdulmajeed Alsufyani and Marco Filetti and Owen, {Adrian M} and Howard Bowman",

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doi = "10.1186/1743-0003-10-82",

language = "English",

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T1 - The cost of space independence in P300-BCI spellers

AU - Chennu, Srivas

AU - Alsufyani, Abdulmajeed

AU - Filetti, Marco

AU - Owen, Adrian M

AU - Bowman, Howard

PY - 2013/7/29

Y1 - 2013/7/29

N2 - BACKGROUND: Though non-invasive EEG-based Brain Computer Interfaces (BCI) have been researched extensively over the last two decades, most designs require control of spatial attention and/or gaze on the part of the user.METHODS: In healthy adults, we compared the offline performance of a space-independent P300-based BCI for spelling words using Rapid Serial Visual Presentation (RSVP), to the well-known space-dependent Matrix P300 speller.RESULTS: EEG classifiability with the RSVP speller was as good as with the Matrix speller. While the Matrix speller's performance was significantly reliant on early, gaze-dependent Visual Evoked Potentials (VEPs), the RSVP speller depended only on the space-independent P300b. However, there was a cost to true spatial independence: the RSVP speller was less efficient in terms of spelling speed.CONCLUSIONS: The advantage of space independence in the RSVP speller was concomitant with a marked reduction in spelling efficiency. Nevertheless, with key improvements to the RSVP design, truly space-independent BCIs could approach efficiencies on par with the Matrix speller. With sufficiently high letter spelling rates fused with predictive language modelling, they would be viable for potential applications with patients unable to direct overt visual gaze or covert attentional focus.

AB - BACKGROUND: Though non-invasive EEG-based Brain Computer Interfaces (BCI) have been researched extensively over the last two decades, most designs require control of spatial attention and/or gaze on the part of the user.METHODS: In healthy adults, we compared the offline performance of a space-independent P300-based BCI for spelling words using Rapid Serial Visual Presentation (RSVP), to the well-known space-dependent Matrix P300 speller.RESULTS: EEG classifiability with the RSVP speller was as good as with the Matrix speller. While the Matrix speller's performance was significantly reliant on early, gaze-dependent Visual Evoked Potentials (VEPs), the RSVP speller depended only on the space-independent P300b. However, there was a cost to true spatial independence: the RSVP speller was less efficient in terms of spelling speed.CONCLUSIONS: The advantage of space independence in the RSVP speller was concomitant with a marked reduction in spelling efficiency. Nevertheless, with key improvements to the RSVP design, truly space-independent BCIs could approach efficiencies on par with the Matrix speller. With sufficiently high letter spelling rates fused with predictive language modelling, they would be viable for potential applications with patients unable to direct overt visual gaze or covert attentional focus.

KW - Brain-Computer Interfaces

KW - Electroencephalography

KW - Evoked Potentials

KW - Humans

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DO - 10.1186/1743-0003-10-82

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SN - 1743-0003

VL - 10

JO - Journal of neuroengineering and rehabilitation

JF - Journal of neuroengineering and rehabilitation

IS - 82

ER -

The cost of space independence in P300-BCI spellers

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