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  Phase-locking and amplitude modulations of EEG alpha: Two measures reflect different cognitive processes in a working memory task

Herrmann, C. S., Senkowski, D., & Röttger, S. (2004). Phase-locking and amplitude modulations of EEG alpha: Two measures reflect different cognitive processes in a working memory task. Experimental Psychology, 51(4), 311-318. doi:10.1027/1618-3169.51.4.311.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-D085-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-5A25-1
Genre: Journal Article

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Herrmann_ExpPsy2004.pdf (Publisher version), 441KB
 
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 Creators:
Herrmann, Christoph S.1, Author              
Senkowski, Daniel1, Author              
Röttger, Stefan, Author
Affiliations:
1Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              

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 Abstract: It has been demonstrated in numerous experiments that oscillatory EEG responses in the alpha frequency band (8-12 Hz) increase with memory load during the retention interval in working memory tasks. However, the findings diverge with respect to which measurement of alpha activity is influenced by memory processes. Here, we differentiate between evoked and total alpha activity in order to separate effects of phase-locking and amplitude modulation. We present data from a delayed-matching-to-sample task (S1-S2 paradigm) for which we compared EEG alpha responses between a perception and a memory condition. Increased total alpha activity was found in the retention interval for the memory as compared to the perception condition. Evoked alpha activity, however, did not differentiate between memory and perception conditions but, instead, was increased for the more complex condition of processing non-Kanizsa figures as compared to Kanizsa figures. Thus, our results demonstrate a functional differentiation between evoked and total alpha activity. While alpha phase locking seemed to be influenced mainly by task complexity, alpha amplitude clearly reflected memory demands in our paradigm.

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Language(s): eng - English
 Dates: 2004
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: eDoc: 239280
DOI: 10.1027/1618-3169.51.4.311
Other: P6779
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Title: Experimental Psychology
Source Genre: Journal
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Publ. Info: Göttingen, Germany : American Psychological Association (PsycARTICLES)
Pages: - Volume / Issue: 51 (4) Sequence Number: - Start / End Page: 311 - 318 Identifier: ISSN: 1618-3169
CoNE: /journals/resource/954925573941