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  A MEG analysis of the P300 in visual discrimination tasks

Mecklinger, A., Maess, B., Opitz, B., Pfeifer, E., Cheyne, D., & Weinberg, H. (1998). A MEG analysis of the P300 in visual discrimination tasks. Evoked Potentials-Electroencephalography and Clinical Neurophysiology, 108(1), 45-56. doi:10.1016/S0168-5597(97)00092-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-9BE7-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-F669-4
Genre: Journal Article

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 Creators:
Mecklinger, Axel1, Author              
Maess, Burkhard1, Author              
Opitz, Bertram1, Author              
Pfeifer, Erdmut1, Author              
Cheyne, D., Author
Weinberg, H., Author
Affiliations:
1MPI of Cognitive Neuroscience (Leipzig, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634574              

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Free keywords: P300; MEG; Visual discrimination; 'What' and 'where'
 Abstract: Based on recent research that indicated that P300 scalp topography varies as a function of task and/or information to be processed, this study examined scalp-recorded magnetic fields correlated with the P300 by means of whole-head magnetoencephalography. Subjects performed two discrimination tasks, in which targets, defined on either object or spatial characteristics of the same visual stimuli, had to be discriminated. Based on the across-subject root mean square (RMS) functions a sequence of 4 components could be identified in both tasks, N1m, P3m, and two later components, which, based on their estimated neuronal sources, were classified as representing motor processes during and following the manual responses to target stimuli. Reliable between-task differences in source localization were obtained for the P3m component, but not for the other components. Inferior-medial sources were found for the P3m evoked by both spatial and object targets, with these sources being located about 3.5 cm more anterior for object targets. These results suggest that different neuronal sources, possibly located in subcortical regions in the vicinity of the thalamus, contribute to the P3m evoked by target stimuli defined by either object or spatial stimulus characteristics.

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Language(s): eng - English
 Dates: 1998
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 239114
DOI: 10.1016/S0168-5597(97)00092-0
ISI: 000071980000005
Other: P6666
 Degree: -

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Title: Evoked Potentials-Electroencephalography and Clinical Neurophysiology
  Other : Evoked Potential.-Electroencephalogr. Clin. Neurophysiol.
Source Genre: Journal
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Publ. Info: Amsterdam, etc. : Elsevier
Pages: - Volume / Issue: 108 (1) Sequence Number: - Start / End Page: 45 - 56 Identifier: ISSN: 0168-5597
CoNE: /journals/resource/954926941726_1