4.4. Limitation of the Study
Several limitations of the study should be considered. One of these limitations is the sample blinding method. In the discussed paper, the double-blind standard was not maintained. The project assistants knew to which groups the participants were assigned. Another limitation is the cognitive material (the maze game with increasing difficulty) used in the training sessions could be repetitive and monotonous for participants, possibly implicating reduced motivation. The last limitation would be the participants group. The participants were a group of healthy older adults, mostly women (73% of participants), seeking some cognitive activity.