Document Detail

Spectral analysis of tremor: understanding the results.
MedLine Citation:
PMID:  2283529     Owner:  NLM     Status:  MEDLINE    
Spectral analysis of a tremor record can sometimes produce a spectrum with multiple components of significant amplitude. The problem is to determine whether the presence of several peaks represents the coexistence of separate tremor mechanisms or be a consequence of fluctuations in the frequency or amplitude of a single tremor. The spectrum of a tremor whose frequency or amplitude vary and are independent has the recognisable pattern of a central carrier frequency with sidebands of equal amplitudes distributed symmetrically around the carrier. However, if tremor amplitude and frequency fluctuate and are not independent, (frequency proportional to amplitude or frequency inversely proportional to amplitude), the spectrum has a pattern of sidebands which are asymmetrical in amplitudes and may resemble the spectrum of the combined signal from different independent oscillators. The investigation of sidebands in spectra has been neglected in tremor studies and multiple irregular peaks on a tremor spectrum have sometimes been used wrongly as evidence for the coexistence of multiple tremor mechanisms or frequency components assumed to be concurrent.
M Gresty; D Buckwell
Related Documents :
17520359 - Capture of activation during ventricular arrhythmia using distributed stimulation.
12914849 - Low-power xix decoupling in mas nmr experiments.
11295779 - Validation for tremor quantification of an electromagnetic tracking device.
16443239 - A new method in applying power spectral statistics to examine cardio-respiratory intera...
10996189 - Breathing frequencies of northern elephant seals at sea and on land revealed by heart r...
2096659 - Superposition of arteriolar vasomotion waves and regulation of blood flow in skeletal m...
19431729 - Energetic efficiency of hydrogen photoevolution by algal water splitting.
2032459 - Development of a frequency dimension in chickens (gallus gallus).
12429189 - Coordination and control of forces during multifingered grasping in parkinson's disease.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neurology, neurosurgery, and psychiatry     Volume:  53     ISSN:  0022-3050     ISO Abbreviation:  J. Neurol. Neurosurg. Psychiatr.     Publication Date:  1990 Nov 
Date Detail:
Created Date:  1991-03-18     Completed Date:  1991-03-18     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2985191R     Medline TA:  J Neurol Neurosurg Psychiatry     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  976-81     Citation Subset:  IM    
Medical Research Council Human Movement and Balance Unit, National Hospital, London, United Kingdom.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Computer Simulation
Electromyography / instrumentation*
Models, Theoretical
Nervous System / physiopathology
Parkinson Disease / diagnosis,  physiopathology*
Signal Processing, Computer-Assisted / instrumentation*
Tremor / diagnosis,  physiopathology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  The accuracy of predictions about progress of patients on a stroke unit.
Next Document:  Lumbosacral evoked potentials and vesicourethral function in patients with chronic suprasacral spina...