Effect of posterized naturalistic stimuli on SSVEP-based BCI

Ng, Kian B., Bradley, Andrew P. and Cunnington, Ross (2013). Effect of posterized naturalistic stimuli on SSVEP-based BCI. In: Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE. 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013, Osaka, Japan, (3105-3108). 3 - 7 July 2013. doi:10.1109/EMBC.2013.6610198


Author Ng, Kian B.
Bradley, Andrew P.
Cunnington, Ross
Title of paper Effect of posterized naturalistic stimuli on SSVEP-based BCI
Conference name 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013
Conference location Osaka, Japan
Conference dates 3 - 7 July 2013
Proceedings title Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE   Check publisher's open access policy
Journal name IEEE Engineering in Medicine and Biology Society. Conference Proceedings   Check publisher's open access policy
Place of Publication Piscataway, NJ United States
Publisher Institute of Electrical and Electronics Engineers
Publication Year 2013
Year available 2013
Sub-type Fully published paper
DOI 10.1109/EMBC.2013.6610198
Open Access Status
ISBN 9781457702167
ISSN 1557-170X
Start page 3105
End page 3108
Total pages 4
Collection year 2014
Language eng
Abstract/Summary Most visual stimuli used in steady-state visual evoked potential (SSVEP)-based brain-computer interface (BCI) are simple and elementary. Examples of such stimuli are checkerboard patterns and sinusoidal gratings. These stimuli exhibit distinct contrasts and edges that conform well to the simple cortical cells behavior first observed by Hubel and Weisel. Hence, they are effective in eliciting VEP. On the other hand, the use of naturalistic stimuli is known to advance our understanding of early visual system. However, naturalistic stimuli are spectrally and spatially complex. They may not elicit the optimal VEP and the results obtained may not easily correlate to the stimulus parameters. Hence, we proposed to posterize natural images to generate naturalistic stimuli suitable for SSVEP-BCI. The posterization process considers both the edge and contrast information of the input image. This study elucidates the effect of posterized naturalistic stimuli on SSVEP amplitudes and phases by exploring the relationship between the number of tones of posterized visual stimuli and their effect on the power spectra and phase synchrony of attended stimuli. Results show that posterized visual stimuli at four tone display a significant effect on the dominant frequency response. Our findings suggest the effectiveness of posterized naturalistic stimuli and should advance the use of naturalistic stimuli in SSVEP-BCI.
Subjects 1707 Computer Vision and Pattern Recognition
1711 Signal Processing
2204 Religion and Religious Studies
2718 Health Informatics
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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