Computationally efficient approaches to calculating significant ERD/ERS changes in the time–frequency plane

This paper addresses some practical issues related to the calculation, display and assessment of the significance of changes in the average time–frequency energy density of event-related brain activity. Using scalp EEG and subdural ECoG example datasets, parametric tests are evaluated as a replaceme...

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Bibliographic Details
Published in:Journal of neuroscience methods 2005-06, Vol.145 (1), p.267-276
Main Authors: Żygierewicz, J., Durka, P.J., Klekowicz, H., Franaszczuk, P.J., Crone, N.E.
Format: Article
Language:English
Subjects:
Adult
Algorithms
Brain - physiology
Brain Mapping - methods
Electroencephalography
ERD
ERS
Evoked Potentials - physiology
Humans
Male
Signal Processing, Computer-Assisted
Statistical maps
Time–frequency energy density
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Summary:This paper addresses some practical issues related to the calculation, display and assessment of the significance of changes in the average time–frequency energy density of event-related brain activity. Using scalp EEG and subdural ECoG example datasets, parametric tests are evaluated as a replacement for previously applied computer-intensive resampling methods. The performance of different estimates of energy density, based on matching pursuit, scalogram and spectrogram, and their Box–Cox transformations is evaluated with respect to the assumption of normality required for the t-test, and the consistency of the final results.
ISSN:0165-0270
1872-678X
DOI:10.1016/j.jneumeth.2005.01.013