Electro Encephalogram(EEG)

Electro Encephalogram shortly called EEG is used to record the electrical activity of the brain. This electric al activity is measured in the form of electric potentials. This process is called as Electro Encephalography. By placing two electrodes on the scalp of the patient, and leading via suitable amplifier to a CRT or to a ink-writing device, a record of four different types of waves can be obtained. These waves are named as alpha, beta, delta and theta. They vary in their frequency. These waves give the characteristic activity of the brain, and that is useful for study of brain problems like tumors, cerebral palsy, etc.