Abstract
For the past decade the surgical approach to the treatment of mental disease has been attaining increasing prominence 1 and recognition 2 in this country. As an attack on the intact brain tissue for the relief of mental symptoms, it is comparable to differential section of the posterior trigeminal root for the relief of intractable physical pain. 3 The first, and isolated, attempts at surgical treatment of mental derangements can be traced back to Burckhardt's 4 unilateral multiple cortical excisions (1890), to Puusepp's 5 unilateral subcortical section of the centrum semiovale in the frontal region of the dominant hemisphere (1906 to 1910) and to ody's 6 unilateral lobectomy (1936). The recent discoveries in the field of neurophysiology 7 and psychopathology 8 were put into use by Egas Moniz and Almeida Lima 9 (1935) on the European continent. Freeman and Watts, 10 in this country, have introduced and improved the method
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