Effect of intertrial interval upon alternation behavior in the shocked rat
Psychol Repts 6: 266
Eighteen rats were forced to run by shock for 20 trials. Intertrial intervals of 0 sec., 10 sec., 30 sec., 60 sec., 3 min. or 10 min. were used. Mean percent alternations on 6 test days (11 free trials each) were significantly different, shorter intervals being associated with more frequent alternation.