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Il;lectro-encephalographic recording from electrodes on the scalp has given valuable information in the diagnosis and treatment of a number of neurologic disorders, such as brain injuries, brain tumors and epilepsy. However, the results have been rather disappointing with respect to mental disorders.On the other hand, recording from the depths of the brain by means of intracerebral microelectrodes has given valuable diagnostic, therapeutic and neurophysiologic information in patients suffering from mental disorders. It should be pointed out immediately that such examinations have been carried out only in connection with operations on the brain. The results of such recordings frequently have made it possible to limit substantially the final surgical operation. T E C H N I COur technic has been described in an earlier communication ( 1 ) .However, in the last year, the number of contacts has been increased at the same time as the over-all diameter of the electrodes has been decreased 1)y the utilization of finer wires. A t the present, 46-gauge wire (37.5 microns in diameter) is utilized. The wires are only one eighth the size of those used a year ago. The location of the electrodes i s checked roentgenographically.