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XII. 



DEGEIs^EEATIOXS EESTILTmG EEOM LESIO^^S OE THE 

 CORTEX OF THE TEMPOEAL LOBE. Ex W. H. 

 THOITPSOX, ir.D., DunviUe Professor of Physiology, Queen's. 

 College, Belfast. 



(Plates XIV., XY., ajnd Eig-ht Eigukes in Text.) 



[cOilinrN-ICATED BY PEOFESSOE D. J. CTHSTfliS^GHAlI, E.E.S.] 

 [Eead Febrl-aky 27, 1900.] 



The investigation from which the following results have been 

 obtained was begun as far back as the year 1892, in the Physiological 

 Department of University College, London, under the guidance of 

 Professor E. A. Schafer. It was subsequently continued in the 

 Physiological Laboratory of this College, where most of the work has 

 in fact been canied out. The completion of the research has however 

 been delayed by several inten-uptions. 



Two preliminary communications dealing with some of the results 

 obtained were made in 1892, one before the Pathological Society of 

 London, the other before the Section of Anatomy and Physiology of 

 the Eoyal Academy of Medicine, Dublin. A more detailed account 

 was given at the meeting of the British Medical Association in 

 Montreal in 1897. 



Objects of the Eeseaech. 



At the time this inquiry was undertaken, much controversy 

 existed concerning the seat of the cortical representation of the sense 

 of hearing. Eenier, Munk, and Schafer, proceeding chiefly from the 

 immediate residts of extirpation of portions of the cortex of the 

 temporal and occipital lobes, had all arrived at different, and in many 

 respects contradictory views, regarding the precise region in which 

 this sense is represented. Eerrier, as is well known, had located it in 

 the upper end of the superior temporal convolution. Munk's auditory 

 sphere, on the other hand, embraced portions of both temporal and 

 occipital lobes ; while Schafer, without assigning the sensation to any 



E.I.A. PKOC, SEE. III., VOL. Vr. 



