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An Overview of EEG and MEG 

An Overview of EEG and MEG
An Overview of EEG and MEG

Riitta Hari

, and Aina Puce

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date: 06 March 2021

This chapter discusses the rather different histories of MEG and EEG. EEG has been used as a tool of clinical diagnostics since the 1930s with visual inspection of spontaneous EEG activity in patients suffering from various brain disorders, particularly epilepsy. For MEG, the evolution of applications has been the opposite: the first recordings were made in research laboratories and the recordings started by averaging a very high number of single trials, and it took some time before low-noise MEG equipment became available to allow single-trial analyses. Only with recent technical developments, especially with the advent of whole scalp–covering devices, has MEG become increasingly popular in the clinical environment. We discuss the evolution of both techniques with respect to the measurement of brain rhythms and evoked and event-related responses.

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