Book contents
- How to Read an EEG
- Reviews
- How to Read an EEG
- Copyright page
- Dedication
- Contents
- Figure Contributions
- Foreword to the First Edition
- Preface
- How to Read This Book
- Part I Basics
- Chapter 1 Introduction
- Chapter 2 Polarity and Montages
- Chapter 3 Localization
- Chapter 4 Frequency and Rhythm
- Chapter 5 Maturation
- Chapter 6 Normal Adult EEG
- Part II Interpretation
- Part III Specific Conditions
- Appendix: How to Write a Report
- Index
- References
Chapter 3 - Localization
from Part I - Basics
Published online by Cambridge University Press: aN Invalid Date NaN
Book contents
- How to Read an EEG
- Reviews
- How to Read an EEG
- Copyright page
- Dedication
- Contents
- Figure Contributions
- Foreword to the First Edition
- Preface
- How to Read This Book
- Part I Basics
- Chapter 1 Introduction
- Chapter 2 Polarity and Montages
- Chapter 3 Localization
- Chapter 4 Frequency and Rhythm
- Chapter 5 Maturation
- Chapter 6 Normal Adult EEG
- Part II Interpretation
- Part III Specific Conditions
- Appendix: How to Write a Report
- Index
- References
Summary
This chapter describes localization using bipolar and referential montages and includes the concepts of active reference and how to select a suitable reference when using referential montages. Localization is the art of locating the site of maximal potential on the cortical surface, presumably the origin of a waveform. This depends on the montage and rules of polarity. Certain regions such as sulcal depths, inferior surfaces, and very small potentials may be surface EEG negative. Bipolar montages use phase reversals and referential montages use maximum amplitude for localization. An apparent phase reversal on a referential montage suggests the possibility of a horizontal dipole or an active reference. Active reference occurs when the reference electrode lies close to the potential focus or becomes contaminated by artifact leading to false localizations. Therefore, it is important to select relatively inert electrodes as reference electrodes when using a referential montage. [145 words/844 characters]
Information
- Type
- Chapter
- Information
- How to Read an EEG , pp. 24 - 32Publisher: Cambridge University PressPrint publication year: 2025
References
Lagerlund, TD. Manipulating the magic of digital EEG: montage reformatting and filtering. American Journal of Electroneurodiagnostic Technology. 2000 Jun 1;40(2):121–36.10.1080/1086508X.2000.11079295CrossRefGoogle Scholar
Acharya, JN, Acharya, VJ. Overview of EEG montages and principles of localization. Journal of Clinical Neurophysiology. 2019 Sep 1;36(5):325–9.10.1097/WNP.0000000000000538CrossRefGoogle ScholarPubMed
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