What tests show the brains electrical activity?
• Electroencephalogram (EEG) — Small metal disks (electrodes) are placed at strategic locations on a person’s scalp. The electrodes can detect the electrical activity in the form of impulses that are then transcribed to paper. By observing such impulse characteristics as intensity (the size of the impulse), duration (the width of the impulse), frequency (how often impulses occur during a given time) and location (what region of the brain produces these impulses), an EEG can provide valuable information about underlying problems in the brain. Some people who have strokes are prone to seizures, and this test will help doctors determine if seizures are present and if treatment with medications is needed. • Evoked response test — A diagnostic procedure that provides a measurement of the brain’s ability to process and react to different sensory stimuli. A doctor evokes a visual response by flashing a light or checkerboard pattern in front of a patient. For auditory evoked responses, a docto
