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[The applied time interval as a learnable dimension].

The possibility of learning time intervals was examined. 7 male BDE-rats (70 days old at the beginning of the experiments) were trained (shock avoidance learning) in a modified test chamber to learn bar-pressing only in distinguished time periods (LD 12 : 12). In a second part of the experiment it was examined with 5 rats what effect an extension of the light phase has. The results show that there is a possibility of learning time intervals and of maintaining this behaviour under these specific conditions of training.