Finally, it may be questioned whether the better improvement in patients treated with treadmill may be due to the habituation to treadmill walking. We used the software of the motorized treadmill only to evaluate gait speed and stride cycle. It should be noted that the patients treated with treadmill training and auditory and visual cues had better results at the end of treatment with significant improvements also in FOGQ score and that the functional indicator which showed the most impressive improvement was the distance walked in the 6-minute walking test, a result which cannot be attributed to habitual use of a treadmill. Hence, we think that habituation to treadmill walking did not play a relevant role in our results and their interpretation.