Performance of the ndBMI depends on the resolution of the sensory interface.

(A) An illustration of one of the data sets used in this study (data set 6) which is obtained by stimulating 8 electrodes organized in a square grid with 4 different electrical amplitudes. (B,D) The actual trajectories (lines colored in red-tonality) obtained with the Multiple-points algorithm and the ideal trajectories (black lines) superimposed to the sensory regions (areas colored in blue-tonality) for a Gaussian force field (top) and Dipole force field (bottom). (C,E) bar chart of the average difference (i.e. error) calculated as the difference between the ideal and the actual trajectory for each trial simulated by using the Single-point (blue) and the Multiple-points (red) decoding algorithm. The * denotes that wpte depended significantly on the number of stimuli ( one-way ANOVA) and is placed in correspondence of the number of stimuli for which wpte was significantly different from the “reference” condition with 32 stimuli (Tukey multiple comparison test ).