Table 2.
Parameters utilized in the study of cortical evoked potentials and the P3 cognitive auditory potential.
| Assessment parameters | |
|---|---|
| Type of stimulus | Speech stimulus (80% frequent and 20% rare) |
| Stimulus frequency | Vowel contrast: /i/ (frequent); /a/ (rare) Consonant contrast: /ba/ (frequent); /da/ (rare) |
| Stimulus presentation rate | 1 stimulus per second |
| Electrode positioning | Fz and Cz (active); A1/A2 (reference) |
| Pre-amplifer | Channels 1 and 2: input 1 - active electrodes; input 2 - reference electrodes (jumper) |
| Impedance | ≤ 5 kΩ (individual); ≤ 2 kΩ (between electrodes) |
| Band-pass flter | 1-25 Hz |
| Window | 520 ms |
| Gain | 75000 |
| Intensity | 70 dBHL, binaural stimulation |
| Transducer | 3rd insertion phone |