THERMORECEPTOR PHYSIOLOGY 
MR. ADAMS: Dr. Hensel, have you measured the temperature 
profile around the tip of the thermode? 
DR. HENSEL: Yes, we did; the temperature is measured mostly 
at a distance of 1.5 millimeters apart from the thermode. It is quite 
a steep temperature gradient, and the end of the temperature field 
might be at a distance of about three or perhaps four millimeters, if 
you have a very slow cooling. But, normally, I would say about three 
millimeters around the thermode. 
DR HEMINGWAY: The increase in oxygen consumption rate 
was not very great, not nearly as much as you usually find in shiv- 
ering. I think your maximum increase was about fifty percent. 
DR. HENSEL: The cooling was actually not very deep, and we 
did not observe shivering in this experiment. 
DR. HEMINGWAY: No shivering? 
DR. HENSEL: No, I would not say it was shivering. Sometimes 
we observed some sort of behavioral regulation. The cats were 
curling up a little bit, but no strong shivering occurred in this 
experiment. 
DR. HEMINGWAY: Would this increase be due to some motion, 
some voluntary activity on the part of the cat? 
DR. HENSEL: Not in all cases. 
DR. HEMINGWAY: If he is curling up and moving his muscles, 
it does not take much movement. 
DR. HENSEL: No, some cats sat mostly quietly, and there was 
no visible external motion. 
DR. HEMINGWAY: The cats were very kind to you then! 
DR. HENSEL: Yes. 
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