NDLI: A Robust Method for Detection of Linear and Nonlinear Interactions: Application to Renal Blood Flow Dynamics

Content Provider	Springer Nature Link
Author	Feng, Lei Siu, Kin Moore, Leon C. Marsh, Donald J. Chon, Ki H.
Copyright Year	2006
Abstract	We have developed a method that can identify switching dynamics in time series, termed the improved annealed competition of experts (IACE) algorithm.6 In this paper, we extend the approach and use it for detection of linear and nonlinear interactions, by employing histograms showing the frequency of switching modes obtained from the IACE, then examining time-frequency spectra. This extended approach is termed Histogram of improved annealed competition of experts—time frequency (HIACE-TF). The hypothesis is that frequent switching dynamics in HIACE-TF results are due to interactions between different dynamic components. To validate this assertion, we used both simulation examples as well as application to renal blood flow data. We compared simulation results to a time-phase bispectrum (TPB) approach,16 which can also be used to detect time-varying quadratic phase coupling between various components. We found that the HIACE-TF approach is more accurate than the TPB in detecting interactions, and remains accurate for signal-to-noise ratios as low as 15 dB. With all 10 data sets, comprised of volumetric renal blood flow data, we also validated the feasibility of the HIACE-TF approach in detecting nonlinear interactions between the two mechanisms responsible for renal autoregulation. Further validation of the HIACE-TF approach was achieved by comparing it to a realistic mathematical model that has the capability to generate either the presence or the absence of nonlinear interactions between two renal autoregulatory mechanisms.
Starting Page	339
Ending Page	353
Page Count	15
File Format	PDF
ISSN	00906964
Journal	Annals of Biomedical Engineering
Volume Number	34
Issue Number	2
e-ISSN	15739686
Language	English
Publisher	Springer US
Publisher Date	2006-02-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nonlinear interactions Tubuloglomerular feedback Myogenic Time-phase bispectrum Bispectrum Time varying Radial basis function Expectation-maximization Biochemistry Mechanics Biophysics/Biomedical Physics Biomedical Engineering Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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