MRI is a neuro-imaging technique that is designed to look at physical/anatomical structures of the brain. It has a temporal resolution of 2 seconds-which means it is too slow to measure neuro-function. Neuro function is a measure of how the brain thinks and the speed at which it processes information, which is in milliseconds.
QEEG is a neuro-imaging technique that is fast enough to measure neuro-function down to 100th of a millisecond, which more closely approximates brain processing speed. These faster recordings allow clearer functional measurements of brain performance with regard to thinking and processing information.