Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity
<p/> <p>Time-varying coherence is a powerful tool for revealing functional dynamics between different regions in the brain. In this paper, we address ways of estimating evolutionary spectrum and coherence using the general Cohen's class distributions. We show that the intimate conne...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2010-01-01
|
| Series: | EURASIP Journal on Advances in Signal Processing |
| Online Access: | http://asp.eurasipjournals.com/content/2010/390910 |
| _version_ | 1818849827889348608 |
|---|---|
| author | Gaetz William Liu Cheng Zhu Hongmei |
| author_facet | Gaetz William Liu Cheng Zhu Hongmei |
| author_sort | Gaetz William |
| collection | DOAJ |
| description | <p/> <p>Time-varying coherence is a powerful tool for revealing functional dynamics between different regions in the brain. In this paper, we address ways of estimating evolutionary spectrum and coherence using the general Cohen's class distributions. We show that the intimate connection between the Cohen's class-based spectra and the evolutionary spectra defined on the locally stationary time series can be linked by the kernel functions of the Cohen's class distributions. The time-varying spectra and coherence are further generalized with the Stockwell transform, a multiscale time-frequency representation. The Stockwell measures can be studied in the framework of the Cohen's class distributions with a generalized frequency-dependent kernel function. A magnetoencephalography study using the Stockwell coherence reveals an interesting temporal interaction between contralateral and ipsilateral motor cortices under the multisource interference task.</p> |
| first_indexed | 2024-12-19T06:39:26Z |
| format | Article |
| id | doaj.art-d01e92f6ed084316a2cc5b397b49ad58 |
| institution | Directory Open Access Journal |
| issn | 1687-6172 1687-6180 |
| language | English |
| last_indexed | 2024-12-19T06:39:26Z |
| publishDate | 2010-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Advances in Signal Processing |
| spelling | doaj.art-d01e92f6ed084316a2cc5b397b49ad582022-12-21T20:32:07ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802010-01-0120101390910Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional ConnectivityGaetz WilliamLiu ChengZhu Hongmei<p/> <p>Time-varying coherence is a powerful tool for revealing functional dynamics between different regions in the brain. In this paper, we address ways of estimating evolutionary spectrum and coherence using the general Cohen's class distributions. We show that the intimate connection between the Cohen's class-based spectra and the evolutionary spectra defined on the locally stationary time series can be linked by the kernel functions of the Cohen's class distributions. The time-varying spectra and coherence are further generalized with the Stockwell transform, a multiscale time-frequency representation. The Stockwell measures can be studied in the framework of the Cohen's class distributions with a generalized frequency-dependent kernel function. A magnetoencephalography study using the Stockwell coherence reveals an interesting temporal interaction between contralateral and ipsilateral motor cortices under the multisource interference task.</p>http://asp.eurasipjournals.com/content/2010/390910 |
| spellingShingle | Gaetz William Liu Cheng Zhu Hongmei Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity EURASIP Journal on Advances in Signal Processing |
| title | Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity |
| title_full | Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity |
| title_fullStr | Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity |
| title_full_unstemmed | Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity |
| title_short | Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity |
| title_sort | estimation of time varying coherence and its application in understanding brain functional connectivity |
| url | http://asp.eurasipjournals.com/content/2010/390910 |
| work_keys_str_mv | AT gaetzwilliam estimationoftimevaryingcoherenceanditsapplicationinunderstandingbrainfunctionalconnectivity AT liucheng estimationoftimevaryingcoherenceanditsapplicationinunderstandingbrainfunctionalconnectivity AT zhuhongmei estimationoftimevaryingcoherenceanditsapplicationinunderstandingbrainfunctionalconnectivity |