722 



ARTHUR J. RIOPELLE 



TABLE II 



Summary of Test Performance 



Tests showing no decrement 

 in irradiated chimpanzees 



Me 



Consecutive Discrimination 



2-Choice Delayed Response 



5-Choice Delayed Response 



Sameness-Diflference 



Matching 



Matching Similarities 



Size Transposition 



Serial Discrimination 



Bent-Wire Detours 



Patterned Strings 



Pendulum 



Finger Dexterity 



Strength of Pull 



% correct 



% correct 



% correct 



% correct 



% correct 



% correct 



% correct 



% correct 



% correct 



% correct 



Synchrony of response 



Speed of response 



Intensity of response 



Tests showing decrement 

 in irradiated chimpanzees 



Test 



Measure 



4-Choice Oddity 



Visual Acuity 



Size Discrimination 



5-Choice Delayed Response 



Bent-Wire Detours 



6 Unit Puzzle 



9 Unit Pegboard 



Poker Chip Manipulation 



Wood Block 



Elevator 



Social Behavior 



Operant Conditioning 



% correct 

 % correct 

 % correct 

 Trials attempted 

 Trials attempted 

 Trials attempted 

 Trials attempted 

 Trials attempted 

 Frequency of response 

 Latency of response 

 Interactions 

 Rate of response 



of test performance occurred about 21 days after treatment. The usual signs 

 of anorexia and lassitude occurred with additional indications of abdominal 

 discomfort. An adult male showed no significant behavioral signs until the 

 25th day. He deteriorated rapidly, and on the 28th day, he died of pneu- 

 monia aggravated by experimental undernourishment. 



Table II shows two groups of tests. Above are those tests on which 

 performance remained at preirradiation levels or at the level of a control 

 group. Below are those on which a behavioral change took place. 

 Fourteen tests required the displacement of a particular one of two or more 

 stimulus objects to obtain food reward. Accuracy of performance was assessed 



