REVIEW OF RESEARCH IN U.S.S.R. 



483 



Radiation EH 



■ Radiation m 



«- Radiation E 



■ Radiation HI 



ooooooooo 

 I I — 1 — I — I — I — I 



Radiation I 



Radiation II 





Fig. 3. Similar to figure 1, except that the animal was classified as a weak CNS 

 type. Failure of some responses is noted. Redrawn from Khozak ( 1958). 



controls but would not show a fully dependable reflex until many trials 

 more than the latter. All these reactions are indicative, in the opinion of 

 Soviet scientists, of a failure of internal inhibition. I suggest that the effect 

 can be described in other terms as a loss of fine negative feedback or 

 inhibitory control. Such a loss would perhaps be expected as the first evi- 

 dence of diffuse, mild injury and would account for the pseudo-stimulatory 

 action of radiation. 



With in utero irradiation of animals with different CNS types, the specific 

 reaction seems to depend in part on this parameter. There is no question 

 of injury with these doses, and the animals show major weight loss and 



