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  On the time resolution of event-related desynchronization: A simulation study

Knösche, T. R., & Bastiaansen, M. C. M. (2002). On the time resolution of event-related desynchronization: A simulation study. Clinical Neurophysiology, 113(5), 754-763. doi:10.1016/S1388-2457(02)00055-X.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-CE71-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-5C0C-B
Genre: Journal Article

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 Creators:
Knösche, Thomas R.1, Author              
Bastiaansen, M. C. M., 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: Event-related desynchronization; Brain oscillations; Non-phaselocked activity; Hilbert transform; Electroencephalographic rhythms
 Abstract: Objectives: To investigate the time resolution of different methods for the computation of event-related desynchronization/synchronization (ERD/ERS), including one based on Hilbert transform. Methods: In order to better understand the time resolution of ERD/ERS, which is a function of factors such as the exact computation method, the frequency under study, the number of trials, and the sampling frequency, we simulated sudden changes in oscillation amplitude as well as very short and closely spaced events. Results: Hilbert-based ERD yields very similar results to ERD integrated over predefined time intervals (block ERD), if the block length is half the period length of the studied frequency. ERD predicts the onset of a change in oscillation amplitude with an error margin of only 10–30 ms. On the other hand, the time the ERD response needs to climb to its full height after a sudden change in oscillation amplitude is quite long, i.e. between 200 and 500 ms. With respect to sensitivity to short oscillatory events, the ratio between sampling frequency and electroencephalographic frequency band plays a major role. Conclusions: (1) The optimal time interval for the computation of block ERD is half a period of the frequency under investigation. (2) Due to the slow impulse response, amplitude effects in the ERD may in reality be caused by duration differences. (3) Although ERD based on the Hilbert transform does not yield any significant advantages over classical ERD in terms of time resolution, it has some important practical advantages.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 239336
ISI: 000175742000013
Other: P6801
DOI: 10.1016/S1388-2457(02)00055-X
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Title: Clinical Neurophysiology
  Other : Clin. Neurophysiol.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 113 (5) Sequence Number: - Start / End Page: 754 - 763 Identifier: ISSN: 1388-2457
CoNE: https://pure.mpg.de/cone/journals/resource/954926941726