Table 1.
Stimuli characteristics and signal acquisition parameters for the following auditory electrophysiological testing performed: auditory brainstem response (ABR), middle latency response (MLR), late latency response (LLR), and mismatch negativity (MMN)
| ABR | MLR | LLR | MMN | |
|---|---|---|---|---|
| Stimulus | Click | Click | 1,000 Hz | “DA” (frequent stimulus) |
| “DI” (deviant stimulus) | ||||
| % presentation | NA | NA | NA | 80% frequent |
| 20% deviant | ||||
| Intensity | 90 dB HL | 70 dB HL | 90 dB HL frequent | |
| 80 dB HL deviant | ||||
| Rate | 27.7 per second | 7.1 per second | 1.1 per second | |
| Polarity | Alternating | |||
| Transducers | Insert earphones | |||
| Filters | 100-3,000 Hz | 10-300 Hz | 1-30 Hz | |
| Amplification | 100 k | 50 k | 100 k | |
| Montage | Ipsilateral array | |||
| Electrode placement | Inverting (-) right or left mastoid noninverting (+) high forehead ground low forehead | Inverting (-) right or left mastoid non-inverting (+) vertex ground low forehead | ||