Fig. 4.

Characteristic of neural response upon electrical stimulus. (a) An inter-burst interval histogram without electrical stimulation reveals that burst fires every 10.8 s. (b) Evoked action potentials after electrical stimulation (Stimulus parameters: anodic-first biphasic current stimulation pulse, current amplitude of 20 μA, and a width of 200 μs per phase) show neurons fire immediately after stimulus. (c) A post-stimulus time histogram to show the temporal distribution of electrically evoked action potentials. Neurons respond to the electrical stimuli having latency (time to get the maximum spikes after stimulus) of 25 ms.