EEGLAB is a
MATLAB toolbox distributed under the free
GNU GPL license for processing data from
electroencephalography (EEG),
magnetoencephalography (MEG), and other electrophysiological signals. Along with all the basic processing tools, EEGLAB implements
independent component analysis (ICA), time/frequency analysis, artifact rejection, and several modes of data visualization. EEGLAB allows users to import their electrophysiological data in about 20 binary file formats, preprocess the data, visualize activity in single trials, and perform ICA. Artifactual ICA components may be subtracted from the data. Alternatively, ICA components representing brain activity may be further processed and analyzed. EEGLAB also allows users to group data from several subjects, and to cluster their independent components.