636 



HARRY F. HARLOW 



O 6 



\>-^ 



X:v--o 



• •IRRADIATES {N=I2) 



O OCONTROLS (N=4) 



I I I I I 



200 400 600 800 



ACCUMULATED ROENTGEN DOSE 



Fig. 11. Performance of normal and irradiated monkeys on stress test. 



Fig. 12. Activity apparatus. 



cage between 8 p.m. and 8 a.m. were measured by interruptions of an elec- 

 tric-eye beam. Difficulty was encountered in obtaining consistent records; 

 there were large individual differences, frequent apparatus breakdowns, and 

 vibration of cages. We now believe that activity may best be measured dur- 

 ing testing in a Wisconsin General Test Apparatus (WGTA) or an isolation 

 chamber which we have previously used successfully in determining effects 

 of various cortical and subcortical lesions on total body activity. 



Important areas for assessing the behavioral effects of whole body radia- 

 tion relate to irradiation of the mammal at various stages m utero and soon 

 after birth. The anatomic and embryologic basis for these researches is given 

 by Rugh and Grupp (1959), Hicks (1958) and Hicks et al. (1959). Hicks 



