Document Detail

Evaluation of commercially available electrodes and gels for recording of slow EEG potentials.
MedLine Citation:
PMID:  15792889     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To test the applicability of different types of commercially available electrodes and electrode gels or pastes for recording of slow EEG potentials. METHODS: Experiments were carried out on six types of reusable electrodes (silver, tin and gold cup electrodes, sintered silver-silver chloride (Ag|AgCl), platinum, stainless steel), six disposable Ag|AgCl electrode models, and nine gels or pastes. We studied the parameters, which are critical in slow-potential recording, such as polarization, initial and long-term stability and low-frequency noise. RESULTS: The best results were obtained with the reusable sintered Ag|AgCl electrodes. The six disposable Ag|AgCl electrode models also proved to have appropriate electrical properties. Other types of reusable electrodes suffered from diverse degrees of polarization, baseline drift, low-frequency noise, high resistance, and changes in properties due to wear and tear. Seven out of nine gels or pastes contained a significant amount of chloride, which is a prerequisite for DC stability of Ag|AgCl electrodes, whereas the absolute concentration of chloride had little effect. CONCLUSIONS: Direct current (DC) coupled recording of EEG is critically dependent on the choice of electrode and gel. SIGNIFICANCE: Our results provide rigorous criteria for choosing DC-stable electrodes and gels for DC-coupled or long time-constant AC-coupled recordings of slow EEG potentials.
P Tallgren; S Vanhatalo; K Kaila; J Voipio
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-11-23
Journal Detail:
Title:  Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology     Volume:  116     ISSN:  1388-2457     ISO Abbreviation:  Clin Neurophysiol     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-28     Completed Date:  2005-05-31     Revised Date:  2008-09-10    
Medline Journal Info:
Nlm Unique ID:  100883319     Medline TA:  Clin Neurophysiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  799-806     Citation Subset:  IM    
Department of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65, 00014 Helsinki, Finland.
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MeSH Terms
Electrodes / standards
Electroencephalography / instrumentation*,  methods,  standards*
Gels / standards*
Reg. No./Substance:

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