TEMPERAMENTAL DIFFERENCES IN ALBINO RATS 



123 



Inbred 



Average reaction time for the first and second trials = .18" 



Total number of failures to respond in the first and second trials = 26 



Average reaction time for the first and second trials = .23'' 



Total number of failures to respond in the first and second trials = 43 

 * Excluded from the averages as the accuracy of measurements was uncertain. 



(1) Inbred rats respond more quickly to the auditory stimu- 

 lation than do outbred. (a) Inbred males respond most quickly 

 of all (.18 seconds), (b) Inbred females rank next in quickness 

 of response (.23 seconds), (c) Outbred females rank third (.39 

 seconds), (d) Outbred males are slowest of all (.40 seconds). 



(2) The number of failures to respond obviously to the audi- 

 tory stimulation is both smallest and greatest for the males. 



(a) The inbred males failed to respond 26 times in 116 trials. 



(b) The outbred females failed to respond 39 times in 116 trials. 



