STUART, D. G. 
involved in vomiting reflexes, it could account for the animal's 
inability to vomit effectively. When the animals died their brains 
were fixed in formalin for gross and sometimes histological 
examination. 
The animals were not fed between surgery and the days of 
testing three days after surgery. Three intact cats were therefore 
tested in similar fashion before and after a three-day fast. 
Results . Tables II and III summarize the results for 10 cats 
tested before and after decortication, one cat further tested 28 and 
570 days after decortication, and one hem idecorticate cat tested 
42 days after surgery. 
Three days after decortication all the tested animals shivered 
in response to a mild cooling stress. It was evident, by independent 
observation, that the shivering of these animals lacked continuity 
as the tremor frequently ceased in the various somatic muscles. 
This observation was supported by VO determinations indicating 
a decreased VO associated with shivering after decortication. The 
resting oxygen consumption rates of the animals before and after 
decortication lay within the same range (Table III), but whereas the 
mean elevation in VO during shivering was X2.58 before decorti- 
cation, the mean elevation during shivering after decortication was 
XI. 6. The range of VO elevations during shivering was X2.1 to 
X3.8 when the animals were intact, but after decortication this 
range was more restricted, being Xl.4 to XI. 7. The standard de- 
viation of the ratio for the intact animals (mean value X2.58) was 
0.48 while that for decorticate animals (mean value XI. 6) was 
0.12. 
When tested after decortication, the animals we re hyperactive, 
with sham or undirected rage easily induced by such nocioceptive 
stimuli as pinching the pinna, rectal thermometer insertion or rapid 
body rotation. They tended to hyperventilate at intervals, to have 
violent fits of gross somatic activity (leaping, running) followed by 
periods of complete physical quiescence. They defecated, urinated, 
and vomited excessively in a discoordinated manner with adoption 
of faulty postures for these expulsions. The one animal tested 28 
and 570 days post surgery became more subdued in the second week 
after decortication, assumed a crouched posture and moved slowly 
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