REDINTEGRATION IN ALBINO RAT— A STUDY IN RETENTION 47 



redintegration by which results of the group under con- 

 sideration may be judged. A summary of the results of 

 the present group and the 45-day norm group is contained 

 in Plate IV. 



In considering results, it may be noted particularly that 

 in the learning records of the rats of the present group 

 which had previous training, the average " errors " show 

 that this group had far fewer " errors " than the 45-day 

 norm group; and this fact follows with consistency in 

 redintegration. It is evident in the comparison of Tables 

 VIII-B with Tables IV-C and V-C that the learning 

 of the rats with previous problems was complete in far 

 fewer trials than the norm, one trial per day group. And 

 in redintegration the average number of trials of the group 

 under consideration is not only less than the 45-day norm 

 group but less than that of the group with 30-day retention. 

 In average perfect trials and in average time per trial the 

 superiority of the group with previous training is shown 

 not only in learning but also in redintegration; and further, 

 what is most significant, the superiority holds in this in- 

 instance, not only in comparison with the 45-day norm but 

 also with the group at 30 days. 



In considering the individual records the fact is brought 

 out that the approximate retention period for the maze 

 is increased in the group with previous training. This 

 may be seen when one notes that of the group with previous 

 training there were two perfect records in redintegration, 

 as recorded in Table VIII-B, while not one is recorded 

 perfect in Table IV-C of the group without previous train- 

 ing. A further fact is evident, namely, that after the 

 retention period of the individuals with previous training, 

 the best individual record is far superior to any record 

 of the norm group and equal to the best of the group with 

 30-day retention period, while the poorest record of the 

 group with previous training is superior to the majority 

 of the records of the 45-day norm group and some of the 

 records of the 30-day group. 



From the results of these tables the facts are thus 

 established: First, for learning, that previous training so 

 affects the rat that the subsequent acquirement of a new 



