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  EEG source imaging during continuous viewing of natural movies

Whittingstall, K., Bartels, A., Kwon, S., Singh, V., & Logothetis, N. (2009). EEG source imaging during continuous viewing of natural movies. Poster presented at 39th Annual Meeting of the Society for Neuroscience (Neuroscience 2009), Chicago, IL, USA.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-C2A8-E Version Permalink: http://hdl.handle.net/21.11116/0000-0002-60A4-8
Genre: Poster

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 Creators:
Whittingstall, KS1, 2, Author              
Bartels, A1, 2, Author              
Kwon, S1, 2, Author              
Singh, V1, 2, Author              
Logothetis, NK1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Electroencephalography (EEG) is a non-invasive neuroimaging tool which can be used to measure brain activity with excellent temporal resolution. By solving the so-called ‘inverse problem’, one can not only study the time-course of activation during a particular task, but also identify the location of the underlying neural sources in the brain. Usually, these methods are applied to averaged data obtained from EEG recordings during which volunteers perform a given, usually brief (0.1-5s) task over many dozens repetitions. This averaging across many brief trials results in clearer responses, as artifactual or randomly occurring events (noise, eye blinks, eye wanderings, etc) will be reduced. Here, we take a radically new approach, and ask whether one can obtain reliable source localization associated to a particular stimulus feature (such as visual contrast) when using complex natural stimuli presented over long periods of time. We made EEG recordings (64 channels) in 7 subjects who passively watched 2 minute long segments from different commercially available movies (the segments were repeated 20 times). We then developed a method based on independent component analysis (ICA) to reject EEG artifacts due to blinks, subject movement, etc. Source localization of this artifact-free data was calculated at each time point of the movie using low resolution electromagnetic tomography (LORETA). We then calculated the correlation coefficient between variations in the EEG source strength in over 6000 voxels within the brain with variations in movie contrast. As expected, we found that visual contrast in the movie mapped specifically to voxels within area V1, thus showing that a feature that varies continuously in its strength can be reliably mapped onto the cortical region involved in its processing. These findings open a new approach to mapping brain function with a high temporal resolution and allow the localization of a multitude of brain areas based on a single experiment using uncontrolled, natural stimuli.

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 Dates: 2009-10
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 6287
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Title: 39th Annual Meeting of the Society for Neuroscience (Neuroscience 2009)
Place of Event: Chicago, IL, USA
Start-/End Date: 2009-10-14 - 2009-10-21

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Title: 39th Annual Meeting of the Society for Neuroscience (Neuroscience 2009)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 651.13 Start / End Page: - Identifier: -