THE ELECTRO-ENCEPHALOGRAM IN CHRONIC POST-TRAUMATIC STATES.

THE electro-encephalographic changes following a recent head injury have been described (Williams, 1941). The observations were made upon 74 cases of head injury selected from a total of 600 because the injury had occurred less than 20 days previously. From these observations it was concluded that the electro-encephalogram (e.e.g.) accurately reflects the abnormal cerebral state caused by a recent head injury, that the progressive changes are a direct indica-tion of improvement or deterioration in this state, and that in the milder degrees of cerebral dysfunction it may demonstrate residual damage after all clinical signs have subsided. presence