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. Author manuscript; available in PMC: 2021 Apr 24.
Published in final edited form as: IEEE Biomed Circuits Syst Conf. 2018 Mar 29;2017:10.1109/biocas.2017.8325200. doi: 10.1109/biocas.2017.8325200

Figure 4.

Figure 4.

Stimulation detection for subjects A1 (left) and A2 (right). Multiple stimulation pulse widths (pw) and frequencies were used for each subject. From the fitted psychometric functions, the detection threshold for subject A1 is 2.1 ms and 4.6 ms for a stimulation frequency of 2 Hz and 20 Hz, respectively. The detection threshold for subject A2 is 0.78 ms and 0.94 ms for a stimulation frequency of 2 Hz and 20 Hz, respectively. The coefficient of determination, R2, is > 0.91 for every psychometric function fit.