Comparison of Different Methods of Time Shift Measurement in EEG

Title:

Comparison of Different Methods of Time Shift Measurement in EEG

Creator:

Jiruška, P., Prokš, J., Drbal, O., Sovka, P., Marusič, P., and Mareš, P.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:31475521-9f92-439c-8fee-f518277610ff
uuid:31475521-9f92-439c-8fee-f518277610ff

Subject:

EEG, Time shift, Signal processing, Cross-correlation, and Phase/coherence

Type:

article, model:article, and TEXT

Description:

Digital signal processing techniques are often used for measurement of small time shifts between EEG signals. In our work we tested properties of linear cross-correlation and phase/coherence method. The last mentioned method was used in two versions. The first version used fast Fourier transform (FFT) algorithm and the second was based on autoregressive modeling with fixed or adaptive model order. Methods were compared on several testing signals mimicking real EEG signals. The accuracy index for each method was computed. Results showed that for long signal segments all methods bring comparably good results. Accuracy of FFT phase/coherence method significantly decreased when very short segments were used and also decreased with an increasing level of the additive noise. The best results were obtained with autoregressive version of phase/coherence. This method is more reliable and may be used with high accuracy even in very short signals segments and it is also resistant to additive noise.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2005 Volume:54 | Number:4

Harvested from:

CDK

Metadata only:

false