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Visual transparent & visual occlusion: An EEG and COP study

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Authors
Goh, K.
Morris, Susan
Lee, W.
Ring, A.
Tan, T.
Date
2016
Type
Conference Paper

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Goh, K. and Morris, S. and Lee, W. and Ring, A. and Tan, T. 2016. Visual transparent & visual occlusion: An EEG and COP study, in Proceedings of the 38th Annual International Conference of the Engineering in Medicine and Biology Society (EMBC), Aug 16-20 2016, pp. 829-832. Orlando, Florida: IEEE.
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Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
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School of Physiotherapy and Exercise Science
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Abstract

Electroencephalography (EEG) and centre of pressure (COP) data were recorded in young adults for 60 seconds during standing in visual transparent (VT) and visual occlusion (VO) conditions. In both of these conditions, participants wore VO liquid crystal spectacles which allowed the experimenter to accurately control visual information being presented or occluded to the participant. Alpha band (8-13 Hz) revealed significant differences in channel-averaged power spectrum in these two conditions, but not theta band (4-8 Hz) and beta band (13-30 Hz). In order to determine which channels contributed to these bands, region-averaged and single-channel power spectrum were computed which revealed similar patterns for eyes-open (VT) and eyes-closed (VO) conditions in each band. COP analysis was performed to understand postural steadiness in VT and VO conditions; the analysis indicated significant and larger time-domain distance measures (mean velocity), time-domain hybrid measures (mean frequency and sway area) and frequency domain measures (centroidal frequency) in the VO condition. The increased of alpha power in most frontal and posterior regions was indicative of the cortical processing of vision.