Brain activation with a maze test: an EEG coherence analysis study in healthy subjects

The maze test is a complex cognitive task involving visuoperceptual, planning and foresight abilities. EEGs were recorded from 20 healthy subjects according to the 10/20 system. Coherence is analogous to a correlation coefficient between the signals recorded by two electrodes and is computed between each electrode paired to all other electrodes. The 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 electrodes, and in the posterior temporal, parietal and occipital regions. EEG coherence analysis detects changes in regions known to be involved in visual processing and executive functions.