Show Summary Details
Page of

Basic Physics and Physiology of MEG and EEG 

Basic Physics and Physiology of MEG and EEG
Basic Physics and Physiology of MEG and EEG

Riitta Hari

, and Aina Puce

Page of

PRINTED FROM OXFORD MEDICINE ONLINE ( © Oxford University Press, 2021. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a title in Oxford Medicine Online for personal use (for details see Privacy Policy and Legal Notice).

date: 26 February 2021

This chapter outlines the general principles of physics and physiology underlying MEG and EEG signals. It introduces charges and electric currents, and the associated electric potentials and magnetic fields. Basic laws of electricity and the relationships between magnetic and electrical fields are examined. The phenomenon of superconductivity is introduced and related to measurements of MEG signals with SQUID sensors. The effects of various tissues and current configurations on MEG and EEG signals are described. Basic principles of source localization, that is modeling the neuronal sources of the observed MEG and EEG signals are described. The spatial accuracy versus precision of source localization is illustrated. Volume conduction, current spread in the different compartments of the body is explained.

Access to the complete content on Oxford Medicine Online requires a subscription or purchase. Public users are able to search the site and view the abstracts for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.