EFFECT OF LENGTH OF BLIND ALLEYS ON ^L\ZE LEARNING 9 



The groupings of the animals made in the experimental pro- 

 cedure are clearly and concisely shown in the general schedule 

 following, arranged according to the mazes used. Thus in Maze 

 IB the first rats used are those called Group Mu, the n indicating 

 that the animals were untrained. The rats of Group S/ were 

 trained, as indicated by the t; i. e., they had learned another 

 maze. Frequent reference to figure I, in connection with the 

 study of this schedule, will make clear which maze was in use 

 for any group in question, and the exact modification of the 

 blind alleys. 



18 



2 



1 



E^ 



7 



I _ 



3 



?! 



fOOD 

 BOX 



CAST 





EAST 



Figure I.— The four mazes used, IB, IIB, lA, and IIA. The heavy lines mark 

 the division between the B- and the A-mazes. Dotted lines across bUnd 

 alleys show position of the shutters. E and E' are the entrances to the mazes. 



GENERAL SCHEDULE OF EXPERIMENTS 



Rats used Practice distributions 



Maze IB 



Mu Group 7 females (9, 11, 12, 13, 14, 16, 18) and 1 male (10). 



Two tests, or runs, daily for ten days, then four daily for 

 three days, then three daily for each rat until eight runs out of 

 ten were correct. (Rat 12 did not complete the habit in time 

 available.) 



S/ Group 4 males (2, 3, 4, 6), trained on Maze IIA. 



Three runs daily for three days, then an intermission for six- 

 teen days (see explanation on next page), then bv the intensive 

 method the rats were run Aug. 29th and 30th each three times 

 at the following periods of day: 9-9:20, 9:40-9:55, 3-3:15, 3:30- 



