Figure 4

Changes in step lengthy symmetry under three different conditions (naïve with no distraction, naïve with distraction, and informed with no distraction) during the period when the distortion was increased (Naïve group data was cited from our previous study [11]). Subjects (n = 12) in naïve group were not aware of the distortion of visual feedback whereas the informed group (n = 9) were aware of it during the trial. The distraction task helped remove subjects’ cognitive action. The vertical lines show the standard deviation among subjects for each distortion level. The small circles indicate distortion changes applied during the trial. The asterisks (*) were marked at distortion levels where the induced step symmetry values were shown to be significantly different between different conditions (p = 0.041).