It has centers connected with the organs of balance in the ears. The brain continually gives off small waves of electricity. To detect these waves, doctors attach wires to the scalp. Electrically driven pens record the waves on continually moving strips of paper. This record is called an electroencephalogram, EEG and helps doctors diagnose certain brain disorders, including epilepsy and brain injury.
Brain waves become abnormal when the brain is damaged or the function disturbed.
Records of the electrical activity of the brain help scientists discover how the brain works.