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Proceedings Paper

Human brain imaging during controlled and natural viewing
Author(s): Stanley A. Klein; Thom Carney; David Kim; Sangita Dandekar; Claudio Privitera
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Paper Abstract

Assorted technologies such as; EEG, MEG, fMRI, BEM, MRI, TMS and BCI are being integrated to understand how human visual cortical areas interact during controlled laboratory and natural viewing conditions. Our focus is on the problem of separating signals from the spatially close early visual areas. The solution involves taking advantage of known functional anatomy to guide stimulus selection and employing principles of spatial and temporal response properties that simplify analysis. The method also unifies MEG and EEG recordings and provides a means for improving existing boundary element head models. In going beyond carefully controlled stimuli, in natural viewing with scanning eye movements, assessing brain states with BCI is a most challenging task. Frequent eye movements contribute artifacts to the recordings. A linear regression method is introduced that is shown to effectively characterize these frequent artifacts and could be used to remove them. In free viewing, saccadic landings initiate visual processing epochs and could be used to trigger strictly time based analysis methods. However, temporal instabilities indicate frequency based analysis would be an important adjunct. The class of Cauchy filter functions is introduced that have narrow time and frequency properties well matched to the EEG/MEG spectrum for avoiding channel leakage.

Paper Details

Date Published: 17 February 2010
PDF: 16 pages
Proc. SPIE 7527, Human Vision and Electronic Imaging XV, 752707 (17 February 2010); doi: 10.1117/12.849104
Show Author Affiliations
Stanley A. Klein, Univ. of California, Berkeley (United States)
Thom Carney, Univ. of California, Berkeley (United States)
David Kim, Univ. of California, Berkeley (United States)
Sangita Dandekar, New York Univ. (United States)
Claudio Privitera, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 7527:
Human Vision and Electronic Imaging XV
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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