) is a functional neuroimaging
technique that detects brain activity
in real time by monitoring changes in the magnetic fields generated by the propogation
of action potential
s down the axon
s and dendrite
s of neuron
MEG is a non-invasive technique that has several advantages over other functional neuroimaging techniques such as Positron Emission Tomography (PET), functional Magnetic Resonance Imaging (fMRI), Electroencephalogram (EEG), etc. First, it can detect very small areas (milimeters across) of activation in the brain. It also does not rely on the use of radioactive materials like some other techniques.
MEG differentiates itself from neuroimaging techniques such as Magnetic Resonance Imaging (MRI) and Computer axial Tomography (CT or CAT) which image brain structure rather than brain function.