Analyzing spatio-temporal patterns of genuine cross-correlations

Rummel, Christian; Müller, Markus; Baier, Gerold; Amor, Frédérique; Schindler, Kaspar (2010). Analyzing spatio-temporal patterns of genuine cross-correlations. Journal of neuroscience methods, 191(1), pp. 94-100. Amsterdam: Elsevier 10.1016/j.jneumeth.2010.05.022

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In multivariate time series analysis, the equal-time cross-correlation is a classic and computationally efficient measure for quantifying linear interrelations between data channels. When the cross-correlation coefficient is estimated using a finite amount of data points, its non-random part may be strongly contaminated by a sizable random contribution, such that no reliable conclusion can be drawn about genuine mutual interdependencies. The random correlations are determined by the signals' frequency content and the amount of data points used. Here, we introduce adjusted correlation matrices that can be employed to disentangle random from non-random contributions to each matrix element independently of the signal frequencies. Extending our previous work these matrices allow analyzing spatial patterns of genuine cross-correlation in multivariate data regardless of confounding influences. The performance is illustrated by example of model systems with known interdependence patterns. Finally, we apply the methods to electroencephalographic (EEG) data with epileptic seizure activity.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic and Interventional Neuroradiology
04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology

UniBE Contributor:

Rummel, Christian; Amor, Frédérique and Schindler, Kaspar Anton

ISSN:

0165-0270

Publisher:

Elsevier

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:08

Last Modified:

06 Dec 2013 13:19

Publisher DOI:

10.1016/j.jneumeth.2010.05.022

PubMed ID:

20566351

Web of Science ID:

000280973300012

URI:

https://boris.unibe.ch/id/eprint/383 (FactScience: 197892)

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