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  Indian J Med Microbiol
 

Figure 4: (a) Evoked acoustic auditory brainstem response signals with 120 dB SPL. The evoked waveforms I to IV indicated that the tested animal had a regular auditory ability; (b) received electrical auditory brainstem response signals intracochlear stimulation current of 500 μA, as shown in (a); (c) received electrical auditory brainstem response signals following extracochlear stimulation with a current of 500 μA, as shown in (c); (d) biphasic waveform of the stimulation current with a period of 200 μs and a tunable amplitude, and; (e) evoked electrical auditory brainstem response signals at different stimulation currents ranging from 100 to 500 μA for the determination of the threshold currents

Figure 4: (a) Evoked acoustic auditory brainstem response signals with 120 dB SPL. The evoked waveforms I to IV indicated that the tested animal had a regular auditory ability; (b) received electrical auditory brainstem response signals intracochlear stimulation current of 500 μA, as shown in (a); (c) received electrical auditory brainstem response signals following extracochlear stimulation with a current of 500 μA, as shown in (c); (d) biphasic waveform of the stimulation current with a period of 200 μs and a tunable amplitude, and; (e) evoked electrical auditory brainstem response signals at different stimulation currents ranging from 100 to 500 μA for the determination of the threshold currents