Fig. 2.

Example inverse latency response surface. A: the inverse of stimulation-evoked movement latency (z-axis) as a function of current intensity (x-axis) and frequency (y-axis). Blue circles represent the distribution of inverse latencies collected for each combination of current intensity and frequency; mesh surface connects the mean of the collected distributions; contour lines of the mesh surface are presented on the x–y axis; color bar conveys scale of inverse latency values. B: slices taken across the surface in A along the y-axis; the lines connect the mean of the inverse of latency distribution evoked at each frequency; the color of each slice indicates the level of fixed current intensity. C: slices taken across the surface in A along the x-axis; the lines connect the mean of the inverse of latency distribution evoked at each current intensity; the color of each slice indicates the level of fixed frequency.