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Few developments in the field of medicine and particularly of psychiatry have been attended with more initial enthusiasm than the discovery of the electrical activity of the brain. Although Caton's revelation in 1870 that it was possible to record electrical impulses from the brain received little attention, the painstaking research of Berger provided the impetus for the sudden and rapid development of electroencephalography from the early thirties. Berger was a psychiatrist and his profession had very high hopes of the electroencephalogram (EEG) especially when it was finally accepted as a genuine phenomenon. Yet it is neurology and neurosurgery that received the more spectacular benefits of the technique which revolutionized the practical and theoretical problems of epilepsy and greatly facilitated the detection of cranial neoplasms and the assessment of head injuries. Meanwhile the specific problems of psychiatry were only partly clarified by ths EEG which has shown itself to be of value mainly in the differential diagnosis of organic, epileptic and socalled functional disorders such as schizophrenia. Nevertheless certain findings in the psychoses do hold promise of ultimately assisting in the understanding of these conditions. While this field is beyond the scope of the present paper, it is important to take note of the application of the EEG in the related field of psychology, in both clinical appraisal and basic research on the determinants of behaviour. The purpose of this paper is to review briefly the general significance of the EEG and to evaluate its specific contribution in the field of disorders of communication.

The electrical activity of the brain in some disorders related to communication