GROUP BEHAVIOR 



157 



far as errors were concerned, but even after long 

 training the performance of pairs was always more 



Fig. 30. Parrakeets learn more rapidly if trained 

 alone than if two are placed together in the maze. A, 

 time per trial; B, errors per trial, (The upper curve is 

 unsmoothed; the lower three have been smoothed mathe- 

 matically.) 



erratic than that of isolated birds. When birds that 

 had been trained to a consistent level of excellence 

 were exchanged so that those formerly isolated were 

 paired and those formerly paired were isolated, their 

 behavior in the maze took on the characteristics 



