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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: J Neural Eng. 2015 Dec 10;13(1):016006. doi: 10.1088/1741-2560/13/1/016006

Figure 5.

Figure 5.

Tear production from gland stimulation with various waveform parameters. (a) Tear volume increases with stimulation amplitude for 500 μs pulses applied at 30 Hz (*p ≤ 0.01 compared to control; n ≥ 6, except 12 mA where n = 3). (b) For constant amplitude and frequency (3 mA pulses at 30 Hz) tear volume increases with pulse duration (*p ≤ 0.05 compared to control, n = 6). (c) Tear secretion increases with pulse repetition frequency up to 70 Hz (3 mA, 500 μs) (*p ≤ 0.01 compared to control, n = 5).