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To the Editor.
—In the transactions of the Philadelphia Neurological Society, published in the June 1951 issue of the Archives, pages 783-786, appears the abstract and discussion of a paper concerning Adrian's second sensory area (frontal and parietal operculum), by Dr. George D. Gammon and associates. Woolsey was the first to show that an irritation of this area in some cases produced ipsilateral and contralateral sensory seizures. The bilaterality was intriguing from the anatomical standpoint. The same author subsequently observed a homolateral sensory response on irritation of the classic postcentral convolution. Then followed other reports, particularly on unilateral chordotomy, which sometimes shows a homolateral sensory loss, demonstrating the absence of decussation of the spinothalamic tract. Moreover, a homolateral motor response was also observed by Penfield and others on irritation of the second sensory area. During the discussion by members of the Society, emphasis was laid on Sweet's work, demonstrating again
Gordon A. ADRIAN'S SECOND SENSORY AREA. AMA Arch NeurPsych. 1951;66(5):632. doi:10.1001/archneurpsyc.1951.02320110097008
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