Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Medical Applications of Finite Mixture ModelsModeling Heterogeneity in Psychophysiology

Medical Applications of Finite Mixture Models: Modeling Heterogeneity in Psychophysiology Chapter 6 6.1 The Electroencephalogram Neuronal population activity in the human cortex generates electric fields which are measurable by placing electrodes at the skull. The electroencephalography (EEG) electrodes are fixed with paste on the scalp and electrical activity is recorded on paper or is stored digitally. The voltage of EEG is low and is measured in tens of microvolts. Traditional EEG systems use 20 electrodes which are fixed to the scalp using paste. The location of the electrodes on the scalp often follows the 10-20 system in order to provide a standardized way to place the electrodes. For example, the locations F ,C and P are obtained by subdividing the distance between nasion z z z and inion in pieces of 10 or 20%, which led to the name of the 10-20 system. Figure 6.1 shows a schematic representation of the 10-20 system with standard electrode names and positions. Obviously there is only limited spatial information, but EEG offers high temporal resolution. Owing to the low spatial resolution, EEG is no longer the only method which provides information on the functioning of the brain. It has to be contrasted with methods such as positron emission tomography and functional magnetic http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Medical Applications of Finite Mixture ModelsModeling Heterogeneity in Psychophysiology

Download PDF
10 pages

Loading next page...
 
/lp/springer-journals/medical-applications-of-finite-mixture-models-modeling-heterogeneity-A0XWjmPrx1
Publisher
Springer Berlin Heidelberg
Copyright
© Springer-Verlag Berlin Heidelberg 2009
ISBN
978-3-540-68650-7
Pages
1 –10
DOI
10.1007/978-3-540-68651-4_6
Publisher site
See Chapter on Publisher Site

Abstract

Chapter 6 6.1 The Electroencephalogram Neuronal population activity in the human cortex generates electric fields which are measurable by placing electrodes at the skull. The electroencephalography (EEG) electrodes are fixed with paste on the scalp and electrical activity is recorded on paper or is stored digitally. The voltage of EEG is low and is measured in tens of microvolts. Traditional EEG systems use 20 electrodes which are fixed to the scalp using paste. The location of the electrodes on the scalp often follows the 10-20 system in order to provide a standardized way to place the electrodes. For example, the locations F ,C and P are obtained by subdividing the distance between nasion z z z and inion in pieces of 10 or 20%, which led to the name of the 10-20 system. Figure 6.1 shows a schematic representation of the 10-20 system with standard electrode names and positions. Obviously there is only limited spatial information, but EEG offers high temporal resolution. Owing to the low spatial resolution, EEG is no longer the only method which provides information on the functioning of the brain. It has to be contrasted with methods such as positron emission tomography and functional magnetic

Published: Dec 8, 2008

There are no references for this article.