

70 K. S. LASHLEY 



hours per day during which the cage revolved almost continu- 

 ously. Thus about 50 per cent of the hour at d was spent in 

 running and this was added to all other periods of great activity 

 for the day. No period of inactivity was counted unless it was 

 a full hour in length and the total inactivity is expressed as the 

 average number of hours per day in which there was no activity. 

 These rather arbitrary methods were selected because they set 

 an absolute standard which may be recognized easily and is not 

 subject to the errors which would arise if we attempted to esti- 

 mate the total activity represented by such a curve as that 

 at c. As an absolute measure of activity this method is 



FIG. 1. A RECORD OF THE ACTIVITY OF FOUR RATS FROM 8 P.M. TO 2 A.M. 

 o, Almost continuous running; b, complete rest; c, partial activity. 



obviously inaccurate, but since the records of all the animals 

 were treated in the same way the method of analysis is valid 

 for comparative work. 



Results 



The determinations of general activity were made with normal 

 animals and with individuals having each of the lesions dealt 

 with in the training experiments. Their records for periods of 

 igreat activity and for periods of inactivity are shown in table 1. 

 / As the records stand they indicate that the parietal cases were 

 least given to active running, though not more than normally 



