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Figure 4 | Journal of NeuroEngineering and Rehabilitation

Figure 4

From: The impact of the stimulation frequency on closed-loop control with electrotactile feedback

Figure 4

Representative tracking performance in six electrotactile feedback conditions for one subject. Reference (dotted lines) and generated trajectories (continuous lines) recorded at six conditions (FTE/FSTIM) for a subject with an average tracking performance. Tracking with visual feedback was most accurate (a). With electrotactile feedback (b)-(f), the subjects could successfully follow the reference trajectory over a broad range of stimulation frequencies, although the quality of tracking decreased considerably at low stimulation frequencies. In the condition 5/5 (e), the tracking was very poor and the subjects had difficulties to even identify the active electrode, i.e. error sign (see black arrows). Interestingly, the quality of tracking recovered when the low rate tracking error information was delivered at a high frequency 5/100 (f).

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