Goal of this tutorial
This page is to give an intuitive understanding of how dipolar sources in the brain project to the sensor array in MEG
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Source orientation and distance to sensors
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The magnetic field wraps around dipolar sources.
In the first image on the right, a single dipolar source is shown (red arrow), along with the theoretical magnetic field it projects to the magnetometer array (recorded on a 4D/BTI MEG system, from the Human Connectome Project). The color scale is such that the most yellow/blue colors correspond to a signal of 10 fT.
The dipole is located in the dorsomedial prefrontal cortex and revolves horizontally without changing position.
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and EEG.
A dipole rotating horizontally
A dipole rotating vertically
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