Towards an Optimization of Stimulus Parameters for Brain-Computer Interfaces Based on Steady State Visual Evoked Potentials

Anna Duszyk , Maria Bierzyńska , Zofia Radzikowska , Piotr Milanowski , Rafał Kuś , Piotr Suffczyński , Magdalena Michalska , Maciej Łabęcki , Piotr Zwoliński , Piotr Durka

Abstract

Efforts to construct an effective brain-computer interface (BCI) system based on Steady State Visual Evoked Potentials (SSVEP) commonly focus on sophisticated mathematical methods for data analysis. The role of different stimulus features in evoking strong SSVEP is less often considered and the knowledge on the optimal stimulus properties is still fragmentary. The goal of this study was to provide insight into the influence of stimulus characteristics on the magnitude of SSVEP response. Five stimuli parameters were tested: size, distance, colour, shape, and presence of a fixation point in the middle of each flickering field. The stimuli were presented on four squares on LCD screen, with each square highlighted by LEDs flickering with different frequencies. Brighter colours and larger dimensions of flickering fields resulted in a significantly stronger SSVEP response. The distance between stimulation fields and the presence or absence of the fixation point had no significant effect on the response. Contrary to a popular belief, these results suggest that absence of the fixation point does not reduce the magnitude of SSVEP response. However, some parameters of the stimuli such as colour and the size of the flickering field play an important role in evoking SSVEP response, which indicates that stimuli rendering is an important factor in building effective SSVEP based BCI systems.
Author Anna Duszyk (Wydział Psychologii)
Anna Duszyk,,
- Wydział Psychologii
, Maria Bierzyńska
Maria Bierzyńska,,
-
, Zofia Radzikowska
Zofia Radzikowska ,,
-
, Piotr Milanowski
Piotr Milanowski,,
-
, Rafał Kuś
Rafał Kuś,,
-
, Piotr Suffczyński
Piotr Suffczyński,,
-
, Magdalena Michalska
Magdalena Michalska,,
-
, Maciej Łabęcki
Maciej Łabęcki,,
-
, Piotr Zwoliński
Piotr Zwoliński,,
-
, Piotr Durka
Piotr Durka,,
-
Journal seriesPlos One, ISSN 1932-6203, (A 35 pkt)
Issue year2014
Vol9
No11
Pages1-11
Publication size in sheets0.5
ASJC Classification1100 General Agricultural and Biological Sciences; 1300 General Biochemistry, Genetics and Molecular Biology; 2700 General Medicine
DOIDOI:10.1371/journal.pone.0112099
URL http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0112099
Languageen angielski
File
plos.pdf of 14-09-2015
2.66 MB
Score (nominal)40
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2014 = 1.148; WoS Impact Factor: 2014 = 3.234 (2) - 2014=3.702 (5)
Citation count*
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Dorobek Naukowy - Preview URLhttp://dn.swps.edu.pl/Podglad.aspx?WpisID=17300
Dorobek Naukowy - Approve URLhttp://dn.swps.edu.pl/Biuro/ZatwierdzanieWpisu.aspx?WpisID=17300
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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