DISTRIBUTION OF EFFORT IX LEARNING IN WHITE RAT 37 



CURVE IV 



LTaTCH box whe>i uearncd With 

 other probucms 



ONE TRIAL 

 THREE TRIALS 

 nvE TRIALS 



>A,,- 



Likewise do the individual curves for the one, three, and five 

 trial groups indicate differences in length and regularity. Again 

 curves representing three and five trials are more irregular than 

 those of one trial. Similar conditions it will be remembered, 

 were recognized when one problem was oft'ered with three and 

 five trials. The irregularity, especially of the early trials, is 

 more evident when several problems are learned together. In 

 order to see this more clearly it is necessary to consult Curves 

 VII, VIII, IX, of the latch box, and Curve X, of the maze. 

 Curve VII shows the individual curves of the one trial groups 

 when the latch box is given alone and when it is presented with 

 two additional problems. In a similar way Curves VIII and IX 

 present the three and five trial groups. Curve X gives the one 

 trial groups of the maze. It is apparent on examining these 

 curves that when one problem is learned the curves are shorter 

 and simpler. This might be expected when consideration is 

 given to the fact that apparently when several problems are 



