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K. S. LASHLEY 



the fact that no allowance could be made for the times during 

 which the rats were inactive. In the earlier trials many of the 

 animals remain quiet in the corners of the maze for rather long 

 periods, so that the differences in rate recorded for the first 

 trials represent differences in the amount of time spent in in- 

 activity rather than differences in actual rate of running during 

 activity. The periods of inactivity rarely, if ever, persist after 

 the third trial, however, so that the averages for later trials ex- 

 press more nearly the true rate of movement. 



TABLE 10 



The rate at which the animals ran in the maze at different periods during the learn- 

 ing process. The rate is expressed in centimeters per second. Average rates, 

 for the first trial, the three successive errorless trials, and for the intervening trials, 

 are given 



The table shows that both in the first trial and in the total 

 of all succeeding trials including the three successive errorless ones 

 the strychninized animals ran more slowly than their controls, 

 that those which had received 0.5 mgm. of caffeine more closely 

 approximated their controls than did any of the other groups, 

 and that those which received a full milligram of caffeine ran 

 most rapidly. It was impossible to keep accurate records of 

 the amount of time spent by the animals in inactivity, but the 

 longer periods were noted, and in so far as can be determined 

 from these the strychninized rats were more continuously and the 



