BRAIN ACTIVATION WITH A MAZE TEST - AN EEG COHERENCE ANALYSIS STUDY IN HEALTHY-SUBJECTS

THE maze test is a complex cognitive task involving visuoperceptual, p lanning and foresight abilities. EEGs were recorded from 20 healthy su bjects according to the 10/20 system. Coherence is analogous to a corr elation coefficient between the signals recorded by two electrodes and is computed between each electrode paired to all other electrodes. Th e maze test provoked changes of coherence mainly within the prefrontal regions, between parietal and central electrodes paired with frontal electrodes, especially the right frontopolar and the left prefrontal e lectrodes, and in the posterior temporal, parietal and occipital regio ns. EEG coherence analysis detects changes in regions known to be invo lved in visual processing and executive functions.