56 



HARRY H. WYLIE 



work was abandoned as far as making it any further test 

 for sensitivity to tonal stimuli was concerned. Hunter's 

 work on Tonal Sensitivity in White Rats, recently published, 

 makes it reasonably clear that the rats, in cases where the 

 bell and pipes were used, were really reacting to the noise 

 element of the stimuli and not to the tonal element. So 

 even if the tuning forks could have been properly con- 

 trolled for such a response as was here required, it is ex- 

 tremely doubtful whether the animal's action would have 

 been affected by it. 



(2) Light to Electric Shock — Three groups of animals 

 were first taught the negative response to the light and 

 then were transferred to the pain. Group XI was trans- 

 ferred directly from light to electric shock. Group XII was 

 given two series of simultaneous light and electric shock 

 after having learned the response to the light and then 

 were transferred to the electric shock, Group XIII was 

 given four series of simultaneous light and electric shock 

 after having learned the response to the light and then 

 were transferred to the electric shock. The results are 

 gathered together in the following tables. These tables 

 indicate the number of series and trials necessary for learn- 

 ing the response to the electric shock after having learned 

 the response to the light, and after having been trained 

 with the simultaneous light and electric shock whenever 

 such training was given. Illustrative curves showing the 

 complete records of certain individuals may be seen on 

 page 36. 



To understand these tables one must keep in mind that 

 only fifteen chances to respond to the stimulus were given 

 in each series of twenty trials. 



Group XI 

 Direct Transfer 

 Animal Trials 



No. 84 165 



No. 85 165 



No. 86 165 



No. 91 135 



No. 97 135 



No. 101 180 



Average 157.5 



10.5 



Group XII 



Transferred after two simultaneous 



series 



Animal Trials Series 



No. 81 150 10 



No. 82 180 12 



No. 89 150 10 



No. 90 135 9 



No. 98 165 11 



Average 156 10.4 



