Abstract
Berger's original observations that the electroencephalogram provided a sensitive indicator of certain pathologic conditions of the brain has received abundant confirmation. Slow delta waves, below the normal alpha frequency of 8 to 12 per second, appear from cortical tissue undergoing irreversible degenerative changes or from a reversible depression of cortical function, such as occurs with low blood sugar,1with certain drugs2or with normal sleep.3The electroencephalogram has also been found useful in the localization of certain focal cortical lesions. Injuries to the head produce both reversible and irreversible changes in cerebral function. Clinical and pneumographic (roentgen) examinations do not always give a clear picture of the nature, extent or localization of cerebral damage. The present study is concerned with the results of electroencephalographic examinations of patients who have suffered various degrees and kinds of injury to the head. The attempt is made to correlate the electroencephalographic
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