Figure 7
From: The impact of the stimulation frequency on closed-loop control with electrotactile feedback
Time delays (TDIO) averaged over all subjects and trials in each condition (VF and FTE/FSTIM). In the VF condition, the delay was significantly lower with respect to the electrotactile feedback conditions. A decrease in the stimulation frequency (tracking error sample rate) led to a sharp increase in the TDIO between the reference and generated trajectory. Similarly to the other performance measures, transmitting the low rate tracking error information at higher frequencies (5/50 and 5/100) decreased the time delay (i.e., Λ shape as for NRMSTE in Figure 6b). The asterisks and horizontal bars denote statistically significant difference between pair of conditions. A black asterisk alone above the condition means that the condition was statistically different from all others.