STUART, D. G. 
SUMMARY 
The results may be summarized as follows: 
(1) Decerebrate cats cannot shiver in the cold but can make 
tremulous spasmodic movements of limitedmetabolic effectiveness 
during rapid cooling. Such movements are more a response to a 
nocioceptive stimulus than a form of organized temperature regu- 
lating response. 
(2) The intensity of shivering in decorticate cats is depressed 
for a short time after surgery even when such animals are "auto- 
nomically" hyperactive. Within four post -operative weeks the 
autonomic hyperactivity ablates and shivering returns to its pre- 
operative intensity. It is thus concluded that the net telencephalic 
influence on shivering is not inhibitory but either a balance of 
inhibiting and facilitating influences or neither. 
(3) Normal shivering involves the integrity and activation of 
the dorsomedial posterior hypothalamus. Cutaneous vasoconstric- 
tion is controlled by neurons within the dorsolateral posterior 
hypothalamus. 
(4) Shivering can be both instigated and suppressed by septal 
stimulation with hi^er stimuli intensities than are necessary to 
evoke or suppress shivering during hypothalamic stimulation. 
(5) Shivering can be suppressed by ventrolateral posterior 
hypothalamic stimulation, and it seems that this suppression is 
mediated at a more caudal level than the hypothalamus. 
These results suggest that septal modulation of shivering is 
secondary to hypothalamic control of the function. There are prob- 
ably other secondary control systems within the telencephalon that 
can also facilitate and suppress shivering by modify inghypothalamic 
activity. This is suggested by the fact that not all telencephalic 
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