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Proceedings Paper

Independent modulators mediate spectra of multiple brain processes in a VR-based driving experiment
Author(s): Shang-Wen Chuang; Ruey-Song Huang; Li-Wei Ko; Jong-Liang Jeng; Jeng-Ren Duann; Tzyy-Ping Jung; Chin-Teng Lin
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Paper Abstract

This study explores the use of Independent Component Analysis (ICA) applied to normalized logarithmic spectral changes in the activities of brain processes separated by spatial filters learned from electroencephalogram (EEG) data using a temporal ICA. EEG data were collected during 1-2 hour virtual-reality based driving experiments, in which subjects were instructed to maintain their cruising position and compensate for randomly induced drifts using the steering wheel. ICA was first applied to 30-channel EEG data to separate the recorded signals into a sum of maximally temporally independent components (ICs) for each of 15 subjects. Logarithmic spectra of IC activities were then submitted to PCA-ICA to find spectrally fixed and temporally independent modulator (IM) processes. The second ICA detected and modeled independent co-modulatory systems that multiplicatively affect the activities of spatially distinct IC processes. Across subjects, we found two consistent temporally independent modulators: theta-beta and alpha modulators that mediate spectral activations of the distinct cortical areas when the participants experience waves of alternating alertness and drowsiness during long hour simulated driving. Furthermore, the time courses of the theta-beta modulator were highly correlated with concurrent changes in subject driving error (a behavioral index of drowsiness).

Paper Details

Date Published: 19 March 2009
PDF: 9 pages
Proc. SPIE 7343, Independent Component Analyses, Wavelets, Neural Networks, Biosystems, and Nanoengineering VII, 73431C (19 March 2009); doi: 10.1117/12.822610
Show Author Affiliations
Shang-Wen Chuang, National Chiao-Tung Univ. (Taiwan)
Ruey-Song Huang, National Chiao-Tung Univ. (Taiwan)
Univ. of California, San Diego (United States)
Li-Wei Ko, National Chiao-Tung Univ. (Taiwan)
Jong-Liang Jeng, National Chiao-Tung Univ. (Taiwan)
Jeng-Ren Duann, National Chiao-Tung Univ. (Taiwan)
Univ. of California, San Diego (United States)
Tzyy-Ping Jung, National Chiao-Tung Univ. (Taiwan)
Univ. of California, San Diego (United States)
Chin-Teng Lin, National Chiao-Tung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 7343:
Independent Component Analyses, Wavelets, Neural Networks, Biosystems, and Nanoengineering VII
Harold H. Szu; F. Jack Agee, Editor(s)

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