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Detecting causality between different frequencies
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Wu, Jianhua, Liu, Xuguang and Feng, Jianfeng (2008) Detecting causality between different frequencies. Journal of Neuroscience Methods, Volume 167 (Number 2). pp. 367-375. doi:10.1016/j.jneumeth.2007.08.022
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Official URL: http://dx.doi.org/10.1016/j.jneumeth.2007.08.022
Abstract
Biological systems are usually non-linear and, as a result, the driving signal frequency (say, MHz) is in general not identical with the output frequency (say, NHz). Coherence and causality analysis have been well-developed to measure the (directional) correlation between input and output signals with identical frequencies (N = M), but they are not applicable to the cases with different frequencies (N A M). In this paper, we propose a novel method called frequency-modified causality (coherence) analysis to resolve the issue. The input or output signal is first modulated by up-sampling or down-sampling, coherence and causality analysis are then applied to the frequency modulated and filtered signals. An optimal coherence and causality is found, revealing the true input-output relationship between signals. The method is successfully tested on data generated from a toy model, the van der Pol oscillator and then employed to analyze data recorded from Parkinson's disease (PD) patients. (c) 2007 Elsevier B.V. All rights reserved.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QA Mathematics Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry |
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| Divisions: | Faculty of Science > Centre for Scientific Computing Faculty of Science > Computer Science |
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| Library of Congress Subject Headings (LCSH): | Time-series analysis, Parkinson's disease -- Research, Neural networks (Computer science), Causation | ||||
| Journal or Publication Title: | Journal of Neuroscience Methods | ||||
| Publisher: | Elsevier BV | ||||
| ISSN: | 0165-0270 | ||||
| Official Date: | 30 January 2008 | ||||
| Dates: |
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| Volume: | Volume 167 | ||||
| Number: | Number 2 | ||||
| Number of Pages: | 9 | ||||
| Page Range: | pp. 367-375 | ||||
| DOI: | 10.1016/j.jneumeth.2007.08.022 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Adapted As: |
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