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  MEG alpha activity decrease reflects destabilization of multistable percepts

Strüber, D., & Herrmann, C. S. (2002). MEG alpha activity decrease reflects destabilization of multistable percepts. Cognitive Brain Research, 14(3), 370-382. doi:10.1016/S0926-6410(02)00139-8.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-C5C7-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-2996-E
Genre: Journal Article

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 Creators:
Strüber, D., Author
Herrmann, Christoph S.1, 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: Neural basis of behaviour; Cognition; Alpha-band; Ambiguous pattern; Multistable perception; Visual awareness; Event-related fields; Magnetoencephalography
 Abstract: Multistable stimuli offer the possibility to investigate visual awareness, since they evoke spontaneous alternations between different perceptual interpretations of the same stimulus and, therefore, allow to dissociate perceptual from stimulus-driven mechanisms. In the present study, we used an ambiguous motion paradigm and compared endogenous reversals of perceived motion direction which occur spontaneously during constant ambiguous stimulation with exogenous reversals that were induced externally by changes of stimulation. Contrasting the two conditions allowed to investigate processes that trigger endogenous reversals, since the related activity should be absent in the exogenous reversal condition. We employed ambiguous dot patterns which can easily be transformed to present two stable motion directions in order to induce exogenous pattern reversals. Whole-head MEG was recorded from 10 subjects. We analyzed event-related fields (ERFs) and oscillatory activity in the alpha and gamma ranges. The results showed P300-like slow waves in response to both endogenous and exogenous reversals reflecting the conscious recognition of pattern reversals. Analyses in the gamma-band did not reveal any significant modulations. The alpha activity showed different time courses for endogenous and exogenous reversals. While the exogenous alpha activity decreased in temporal relation to the pattern reversal, the endogenous alpha activity displayed a continuous decrease starting in the time interval preceding the reversal. This time course of the endogenous alpha activity is consistent with a bottom-up approach to figure reversals, since it reflects a process of destabilization of the actual percept until a switch of visual awareness occurs.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 239052
ISI: 000179429400007
Other: P6606
DOI: 10.1016/S0926-6410(02)00139-8
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Title: Cognitive Brain Research
  Other : Cognit. Brain Res.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 14 (3) Sequence Number: - Start / End Page: 370 - 382 Identifier: ISSN: 0926-6410
CoNE: https://pure.mpg.de/cone/journals/resource/954925385137_2