NDLI: Dipole Source Localization of Flash Visual Evoked Potentials to Cone Specific Stimuli

Content Provider	IEEE Xplore Digital Library
Author	Liebermann, J. Klee, S. Haueisen, J.
Copyright Year	2007
Description	Author affiliation: Ilmenau Tech. Univ., Ilmenau (Liebermann, J.; Klee, S.; Haueisen, J.)
Abstract	This study aimed to analyze the neuronal sources of the visual evoked potentials (VEP) to flash stimuli of the blue- (S-cone) and the red-green (L- and M-cones) color channel of the human visual system. For 11 healthy volunteers a 64 channel electroencephalogram (EEG) was recorded during selective central excitation of S-cones and M- and L-cones. Individual and grand average data were first analyzed topographically. Source localization was then carried out with the help of a realistically shaped three compartment boundary element model and a mirrored moving dipole model restricted to occipital cortex. Two main components, N1 and P1, of blue-and red-green color channel were clearly distinguishable in all subjects. We found a significant latency difference between both stimulation channels for N1 and P1. Results showed no visible differences in the topography and no significant differences in dipole localization between both channels. Talairach coordinates of grand averages indicated activation in area 18. Comparison of results of separately stimulated eyes showed no differences. Our findings revealed that neural processing occurs in the same areas of the visual cortex for stimuli with identical conditions but different spectral properties. The signals of blue-and red-green color channels are transmitted in distinct pathways to the visual cortex, thus the latency differences might be caused by different anatomical and functional properties of these pathways.
Starting Page	32
Ending Page	35
File Size	239036
Page Count	4
File Format	PDF
ISBN	9781424409488
DOI	10.1109/NFSI-ICFBI.2007.4387680
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-12
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Visual system Data analysis Absorption Humans Biomedical informatics Color Brain modeling Electroencephalography Delay Biomedical engineering
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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