Journal
PHYSIOLOGICAL MEASUREMENT
Volume 27, Issue 2, Pages 109-117Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0967-3334/27/2/002
Keywords
amplifier noise; modelling; high-resolution EEG; electrode interface; signal to noise ratio; evoked potentials
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First, the intrinsic random noise sources of a biopotential measurement in general are reviewed. For the special case of an electroencephalographic (EEG) measurement we have extended the commonly used amplifier noise model by biological generated background noise. As the strongest of all noise sources involved will dominate the resulting signal to noise ratio (S/N), we have investigated under which conditions this will be the case. We illustrate experimentally that up to 100 Hz S/N practically depends only on cortical generated background noise, while at a few hundred Hz or more amplifier and thermal noise of interelectrode resistance are the major sources.
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