Figure 2.

Visual displays of the biofeedback. Screen shots of two standard displays of the biofeedback implemented for gait training. Four biofeedback values become available after each step (e.g. left leg stance phase and right leg swing phase). These data can be displayed in a line diagram (A), which is updated twice per stride. Each point represents the biofeedback value of one stride. The values are displayed in independent subplots for each of the four joints. Swing and stance phase are color-coded. Both axes can be adjusted by the therapist in order to adapt the feedback to the current training situation. It is possible to display a selection of biofeedback values (e.g. only one leg, only swing phase, only knee joints) to help the patient focusing on specific aspects. The selected subset of biofeedback values can also be averaged into one value that can be displayed by a smiley (B) which smiles broader for higher and frowns for lower values of the biofeedback during the most recent step.