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ORIGINAL ARTICLES AND CLINICAL CASES 



pillars of the fornix, is replaced by a cyst. The dorsal half of the striate 

 nucleus, including all of the caudate nucleus, is absorbed. .The lenticular 

 nucleus is uninjured. Left hemisphere : The lesion is identical with that on 

 the right. 



No. 18. Small adult male. — The frontal lobes were transected and the 

 caudate nuclei cauterized. For eleven days the animal showed marked dis- 

 turbances of movement, rotating to the right, so that he was unable to eat 

 without assistance. By the twelfth day this trouble had partially cleared up, 

 so that he could walk in a straight line — although he still tended to rotate 



Fig. 6.— Extent of the lesions in No. 18. Arranged as in fig. 5. 



when eating. Training in visual discrimination was begun on the fourteenth 

 day after operation. At first he had great difficulty in making the turns in the 

 training box and in finding food, since the operation rendered him anosmic. 

 In five days (fifty trials) he formed the somaesthetic-motor habits of the training 

 box, so that he could go directly from the starting compartment to the food, 

 correcting the error and orientating promptly when he failed to find food in the 

 darkened alley. He still had some difficulty in recognizing food, and would 

 eat shavings and faeces in the neighbourhood of the food dish, but not else- 

 where. He died twenty-three days after operation. 



Extent of lesions (fig. 6).— Eight hemisphere. The lesion to the cortex 



