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  Adverse listening conditions and memory load drive a common alpha oscillatory network

Obleser, J., Wöstmann, M., Hellbernd, N., Wilsch, A., & Maess, B. (2012). Adverse listening conditions and memory load drive a common alpha oscillatory network. The Journal of Neuroscience, 32(36), 12376-12383. doi:10.1523/JNEUROSCI.4908-11.2012.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-C330-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B106-E
Genre: Journal Article

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Obleser_2012_Adverse.pdf (Publisher version), 2MB
 
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 Creators:
Obleser, Jonas1, Author              
Wöstmann, Malte1, Author              
Hellbernd, Nele2, Author              
Wilsch, Anna1, Author              
Maess, Burkhard3, Author              
Affiliations:
1Max Planck Research Group Auditory Cognition, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_751545              
2Otto Hahn Group Neural Bases of Intonation in Speech, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_1797284              
3Methods and Development Unit MEG and EEG: Signal Analysis and Modelling, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634559              

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Free keywords: Neural oscillations; Alpha; Acoustic degradation; Speech; Working memory; MEG; Auditory processing; Cognitive effort;
 Abstract: How does acoustic degradation affect the neural mechanisms of working memory? Enhanced alpha oscillations (8-13 Hz) during retention of items in working memory are often interpreted to reflect increased demands on storage and inhibition. We hypothesised that auditory signal degradation poses an additional challenge to human listeners partly because it draws on the same neural mechanisms. In an adapted Sternberg paradigm, auditory memory load and acoustic degradation were paramet-rically varied and the magnetoencephalographic (MEG) response was analysed in the time–frequency domain. Notably, during the stimulus-free delay interval alpha power monotonically increased at central–parietal sensors as functions of memory load (higher alpha power with more memory load) and of acoustic degradation (also higher alpha power with more severe acoustic degradation). This alpha effect was super-additive when highest load was combined with most severe degradation. Moreover, alpha oscillatory dynamics during stimulus-free delay were predictive of response times to the probe item. Source localisation of alpha power during stimulus-free delay indicated that alpha generators in right parietal, cingulate, supramarginal, and superior temporal cortex were sensitive to combined memory load and acoustic degradation. In sum, both challenges of memory load and acoustic degradation increase activity in a common alpha-frequency network. The results set the stage for future studies on how chronic or acute degradations of sensory input affect mechanisms of executive control.

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Language(s): eng - English
 Dates: 2012-07-092011-09-262012-07-132012-09-05
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1523/JNEUROSCI.4908-11.2012
PMID: 22956828
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Title: The Journal of Neuroscience
  Other : J. Neurosci.
Source Genre: Journal
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Pages: - Volume / Issue: 32 (36) Sequence Number: - Start / End Page: 12376 - 12383 Identifier: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187_1