MODEL RELEASED. EEG examination. 27-year-old woman undergoing an electroencephalograph (EEG) examination. A doctor is attaching electrodes to her head. The EEG records the electrical activity from different parts of the brain, as it reacts to external visual or auditory stimuli. A computer maps an image of this activity, a process known as Brain Electrical Activity Mapping (BEAM). A comparison of the results is made with EEG data from a normal control subject and a colour map of statistical variance is produced, which can be used in the diagnosis of sensory defects.