TRAINING IN WHITE RATS UPON VARIOUS SERIES OF MAZES 31 



what more difficult mazes. It is the position of blind 

 alley 1 which accounts for this. When the animals came 

 from the C maze, they found themselves in a situation 

 which in the maze or mazes before C had called forth 

 the habit of turning into a runway to the left on entering 

 the maze; and this position in the D maze being occupied 

 by a blind alley which called forth this habit, the learning 

 of the maze was consequently retarded. 



The evidence that the average total number of errors 

 per rat tends to decrease as the number of prior maze- 

 learnings increases is more convincing than any figures 

 furnished by the trial criterion in favor of a similar benefit 

 from the latter point of view, as may be seen from an 

 examination of table 25 and figure 11. 



TABLE 25 



The Average Total Number of Errors per Rat by Groups Having Previously 

 Learned One or More Mazes 



Maze A Maze B Maze C Maze D Maze E 

 Group having learned one pre- 

 ceding maze 16.69 8.25 15.40 21.42 2.20 



Group having learned two pre- 

 ceding mazes 2.07 18.05 6.82 22.36 1.31 



Group having learned three pre- 

 ceding mazes 1.75 9.27 3.64 26.58 .31 



Group having learned four pre- 

 ceding mazes 1.22 6.73 7.29 23.87 00 



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