CLARK, G. 
DR. FREEMAN: I am not sure that I see the basis of the incom- 
patibility. 
DR. CLARK: There is a tremendous difference in the effects of 
the electrolytic lesions as compared to either section or knife cut. 
DR. FREEMAN: That is something entirely new. 
DR. STUART: When you make the knife lesion, how much hypo- 
thalamic and subthalamic tissue is left intact caudal to the section? 
DR. CLARK: All of it. 
DR. STUART: And this animal can regulate against the cold? 
DR. CLARK: Yes. 
DR. STUART: I cannot see where this would disagree with the 
classical literature. 
DR. CLARK: I was thinking primarily of the hypothermia that 
you obtain with the electrolytic lesion. As far as the rest, it is not 
too bad, but I still do not see that area in the anterior pons. 
DR. FREEMAN: Is there sensitivity back there? 
DR. CLARK: Yes. 
DR. FREEMAN: Well, you had the old data, yourself. This was 
not the anterior pons, by the way. This was the anterior midbrain. 
You yourself showed this trailing off of the region of sensitivity. 
DR. CLARK: Yes, that region is way dorsal. 
DR. FREEMAN: Well, do not forget that the stimulus we apply 
here is largely applied dorsally. Those points on the diagram repre- 
sent the tip of the thermode, and this is the greatest extent of 
projection. 
DR. CLARK: You did not try just going down a little way? 
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