Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Tytuł pozycji:

Impact of Stimulus Features on the Performance of a Gaze-Independent Brain-Computer Interface Based on Covert Spatial Attention Shifts

Tytuł:
Impact of Stimulus Features on the Performance of a Gaze-Independent Brain-Computer Interface Based on Covert Spatial Attention Shifts
Autorzy:
Christoph Reichert
Igor Fabian Tellez Ceja
Catherine M. Sweeney-Reed
Hans-Jochen Heinze
Hermann Hinrichs
Stefan Dürschmid
Temat:
visual spatial attention
brain-computer interface
stimulus features
N2pc
canonical correlation analysis
gaze-independent
Neurosciences. Biological psychiatry. Neuropsychiatry
RC321-571
Źródło:
Frontiers in Neuroscience, Vol 14 (2020)
Wydawca:
Frontiers Media S.A., 2020.
Rok publikacji:
2020
Kolekcja:
LCC:Neurosciences. Biological psychiatry. Neuropsychiatry
Typ dokumentu:
article
Opis pliku:
electronic resource
Język:
English
ISSN:
1662-453X
Relacje:
https://www.frontiersin.org/articles/10.3389/fnins.2020.591777/full; https://doaj.org/toc/1662-453X
DOI:
10.3389/fnins.2020.591777
Dostęp URL:
https://doaj.org/article/c285160e13cf4370a8aa36ece6c82e8a  Link otwiera się w nowym oknie
Numer akcesji:
edsdoj.285160e13cf4370a8aa36ece6c82e8a
Czasopismo naukowe
Regaining communication abilities in patients who are unable to speak or move is one of the main goals in decoding brain waves for brain-computer interface (BCI) control. Many BCI approaches designed for communication rely on attention to visual stimuli, commonly applying an oddball paradigm, and require both eye movements and adequate visual acuity. These abilities may, however, be absent in patients who depend on BCI communication. We have therefore developed a response-based communication BCI, which is independent of gaze shifts but utilizes covert shifts of attention to the left or right visual field. We recorded the electroencephalogram (EEG) from 29 channels and coregistered the vertical and horizontal electrooculogram. Data-driven decoding of small attention-based differences between the hemispheres, also known as N2pc, was performed using 14 posterior channels, which are expected to reflect correlates of visual spatial attention. Eighteen healthy participants responded to 120 statements by covertly directing attention to one of two colored symbols (green and red crosses for “yes” and “no,” respectively), presented in the user’s left and right visual field, respectively, while maintaining central gaze fixation. On average across participants, 88.5% (std: 7.8%) of responses were correctly decoded online. In order to investigate the potential influence of stimulus features on accuracy, we presented the symbols with different visual angles, by altering symbol size and eccentricity. The offline analysis revealed that stimulus features have a minimal impact on the controllability of the BCI. Hence, we show with our novel approach that spatial attention to a colored symbol is a robust method with which to control a BCI, which has the potential to support severely paralyzed people with impaired eye movements and low visual acuity in communicating with their environment.

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies