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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Sherman, D.L. Hinich, M.J. Hanley, D.F. Thakor, N.V. |
| Copyright Year | 1998 |
| Description | Author affiliation: Dept. of Biomed. Eng., Johns Hopkins Univ., Baltimore, MD, USA (Sherman, D.L.) |
| Abstract | Evoked potential (EP) recordings remain a sensitive indicator of the cerebral response to episodes of brain injury. Previous investigations focused primarily on power and spectral (Fourier) indicators of injury. These parameters are derived from second order statistics. Nonlinear changes also occur after the induction of hypoxic-ischemic (HI) injury. These alterations may be captured using higher order statistics such as the bicorrelation or third order cumulants. Higher order statistics are able to accurately capture signal shape changes due to phase alterations. The H-statistic examines the size of the lagged terms of the third order cumulant. Large H-statistics reveal embedded quadratic nonlinearities. Additionally, this statistic operates on single evoked potentials. In an animal model of HI injury we show that the baseline evoked potential morphology maintains a high degree of nonlinearity. More than one third of these baseline cases have high H-statistics (p>.95). After recovery from HI injury, the H-statistic shows a uniform distribution where an expected 5% of the cases adopt this probability value. H-statistic changes reveal a distinctive loss of nonlinear character after HI injury. |
| Starting Page | 2046 |
| Ending Page | 2049 |
| File Size | 322848 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780351649 |
| ISSN | 1094687X |
| DOI | 10.1109/IEMBS.1998.747008 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1998-11-01 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Injuries Filters Higher order statistics Testing Shape Coherence Animals Morphology Frequency Delay |
| Content Type | Text |
| Resource Type | Article |
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