4. Discussion
The study is of particular importance in the current literature because it shows the mechanism of reduction of the interference effect during dual-task training when compared to the single-task training. The novelty of this study is the analysis of the progress of dual-task and single-task training using two created indicators: orientation and planning time and number of errors. The results allow for a better understanding of the interference effect reduction mechanisms in the elderly. There were two general assumptions made on the basis of the literature, (1) that the planning time would be longer, and the number of errors would be larger during the dual-task training and that (2) the planning time would be shorter, and the number of errors would be reduced after all types of training (dual and single-tasks training).