The Electro-Encephalogram in Chronic Post-Traumatic States

41 1 to 2 months 48 1 to 2 years 12 2 to 3 months 43 2 to 5 years 8 3 to 6 months 81 over 5 years 22 1 It is difficult to give an exact name to the well-known group of symptoms, outstanding among which are headaches, giddiness, defects of memory, lack of concentration, fatigue, irritability, and changes in mood, which arise after head injuries. The old term " post con- cussional syndrome " has been discarded as inexact and the term " chronic post-traumatic state " is used because its limits are wide. The qualification of " chronic post-traumatic cerebral state" seems undesirable because the syndrome rarely follows injury elsewhere and it is not always due to demonstrable cerebral damage.