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Chapter 4 - Localization

from Part I - Basics

Published online by Cambridge University Press:  24 June 2021

Neville M. Jadeja
Affiliation:
University of Massachusetts Medical School
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Summary

Localization is the art of locating the site of maximal potential, presumably the origin of a waveform of interest. The EEG is relatively blind to certain cortical regions such as the sulcal depths, inferior surfaces of the brain, and infoldings such as the insula. Localization depends on the montage in use and the rule of polarity. Phase reversal is the key to localization with a bipolar montage. Maximal amplitude is the key to localization with a referential montage. Phase reversals are usually but not always adjacent. Nonadjacent phase reversals are separated by an isopotential channel (near flat line). Foci located at the end of a chain in a bipolar montage don’t show a phase reversal. An apparent phase reversal on a referential montage may indicate a horizontal dipole or an active reference.

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Chapter
Information
How to Read an EEG , pp. 23 - 28
Publisher: Cambridge University Press
Print publication year: 2021

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References

Lagerlund, TD. Manipulating the magic of digital EEG: montage reformatting and filtering. American Journal of Electroneurodiagnostic Technology. 2000 Jun 1;40(2):121–36.CrossRefGoogle Scholar
Acharya, JN, Acharya, VJ. Overview of EEG montages and principles of localization. Journal of Clinical Neurophysiology. 2019 Sep 1;36(5):325–9.Google Scholar

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  • Localization
  • Neville M. Jadeja
  • Book: How to Read an EEG
  • Online publication: 24 June 2021
  • Chapter DOI: https://doi.org/10.1017/9781108918923.006
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  • Localization
  • Neville M. Jadeja
  • Book: How to Read an EEG
  • Online publication: 24 June 2021
  • Chapter DOI: https://doi.org/10.1017/9781108918923.006
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Localization
  • Neville M. Jadeja
  • Book: How to Read an EEG
  • Online publication: 24 June 2021
  • Chapter DOI: https://doi.org/10.1017/9781108918923.006
Available formats
×