This is a pioneer work of great importance--the first attempt to record for the general public the tremendous advances of the last twenty years in our knowledge of the mechanics of the brain. These advances have been made possible through the invention of the electroencephalograph (EEG for short), the machine which magnifies the minute electrical impulses transmitted inside the brain. Everyone interested in probing the mysteries of human thought and personality will find his horizons widened by a study of this remarkable book.