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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2010 Sep 2;19(1):84–94. doi: 10.1109/TNSRE.2010.2065241

Fig. 5.

Fig. 5

Stimulation pulses with varying pulse durations (PD) were delivered to the left horizontal SCC of animal CH207 at a range of current amplitudes. Peak excitatory response eye velocity increased with increasing current (A) and charge per phase (B) for all PD tested. Misalignment also increased with increasing current (C) and charge per phase (D) for all PD tested. Shorter PD stimuli required less charge per phase to evoke eye responses of a given velocity (B) and achieved a given velocity with less change in eye movement axis (E) than did longer PD stimuli. Changes in current (or charge) can encode changes in head velocity below ~75°/s without changing axis, but eye rotation axis shifts dramatically as current is increased to encode higher eye velocities. Curves in A–D are least-mean-square fits of cumulative Gaussian distribution functions; curves in E were derived from those fit to A and C.