724 



O. D. ANDERSON 



In order to show the details of the effect, the entire protocol 

 of the experiment is given in table 24. The C-R magnitude 

 increased (20 to 40) in 20 minutes after the injection. Xo 

 increase in the leg movements between stimulations appeared 

 at this time. At the end of 2 hours and 16 minutes, the response 

 to the stimulation was reduced to zero, and during the interval 

 between stimuli the spontaneous movements (nervousness) 

 were enormously augmented (55 to 170 mm.). As the tests 



TABLE 24 



The effect of a single, massive dose of adrenalin upon the conditional 



motor reflex in the dog 



Dog S6S $ 



Exp, riment of Sept. 18, 1933 



DURATION 



OP CON- 

 DITIONED 

 STIMULUS 



C-R IN MM. TO 

 POSITIVE CONDI- 

 TIONED STIMULI : 

 MET. 120 



10 sec. 

 10 sec. 



11:21 

 11:36 



11:41 



11:46 



1:32 p.m. 



1:37 



1:48 



1:53 



1:58 



3:59 



4:04 



4:09 



30 

 15 



intravenously 

 10 



40 



10 

 10 





 10 

 20 

 10 

 10 



4 

 12 



continued the C-R gradually gained in magnitude while the 

 amount of spontaneous movement diminished. At the end of 

 4/{> hours the response was about normal while the movement 

 had diminished to zero. 



Dog 742$, bassethound X English bulldog F x . The motor 

 C-R was used. Only the response to the positive Met. 120 

 was studied. The aim of this experiment was to determine 

 the effect of successive injections of adrenalin upon an es- 

 pecially weak conditioned motor reflex. 



