MAZE STUDIES WITH WHITE RA*T 299 



Uncovering the maze produced no effect. Neither was a dis- 

 turbance manifested by the normals or the anosmics. 



In the cleanliness test the blind and anosmic made 14 errors 

 in one of its trials. Those which were blind and partially anos- 

 mic gave an error record of .50. These animals exhibited about 

 the same degree of sensitivity as the anosmics. Their sensi- 

 tivity was much less than that of either the normals or blinds; 



Only one blind and partially anosmic animal was subjected 

 to a rotation of maze and environment; its error record for six 

 trials was 4.16, which is greater than those for normals or anos- 

 mics, but less than that for the blind rats. 



The blind and anosmic was not affected by a rotation of the 

 maze. A blind and partially anosmic rat gave an error score 

 of 2.50, which is less than that for either anosmics, normals or 

 blinds. 



The blind and anosmic animal was not affected by changes 

 in the position of the maze. The two which were blind and 

 partially anosmic gave an error record of .75 which is less than 

 that for an}^ of the other sensory groups. 



The blind and anosmic rat was disturbed by a rotation of the 

 cage only after a considerable period of exposure to the novel 

 situation. Errors were present in three of fourteen trials. The 

 average error record was .78. The degree of sensitivity was 

 about the same as that for the anosmics. The two blind and 

 partially anosmic animals were more susceptible; their error 

 record was 1.68 for eighteen trials. These animals were dis- 

 turbed less than either the blind or normal groups. 



A significant feature of these results is the practical insen- 

 sitivity of the blind and anosmic rat to all alterations instituted 

 after the mastery of the maze. A total of 50 trials was given, 

 of which 80% were without error. The average error record 

 for the 50 trials was 1.50. In the previous 50 runs, errors were 

 absent in but 59% of the trials and the average error record was 

 2.70. This animal made a better record during the tests than 

 during the later stages of increasing automaticity and after 

 the maze was considered mastered. No errors were present 'in 

 the first four experiments involving a total of 24 trials. • The 

 first indication of a disturbance was manifested in the fifth 

 experiment in which the cage was rotated; a total of 11 errors 

 was made in three of the 14 trials. The sixth test involved the 



