Table 3.
Parameters of stimulation and acquisition of P300 evoked potential.
| Parameters | Alvarenga, 2013 | Leite, 2010 | Leite, 2014 |
|---|---|---|---|
| Stimulation | |||
| Stimulator | 3A insert phone, binaural stimulation | Monoaural stimulation | Supra-aural (TDH-39) |
| Rate | 1 s/s | 1.1 s/s | 1.1 s/s |
| Type | Speech – /da/ rare; /ba/ frequent | Tone burst | Tone burst |
| Paradigm | Oddball frequent – 80%, rare – 20% | Oddball 1 kHz frequent; 1.5 kHz rare – 20% | Oddball 1 kHz frequent (80%); 1.5 kHz rare – 20% |
| Duration | – | – | Rise/fall: 10.00 plateau: 30.00 |
| Intensity | Fixed 80 dBNA | Fixed 75 dBNA | 75 dBnHL |
| Polarity | – | – | Alternating |
| Acquisition | |||
| Time of analysis | – | 512 ms | 300 ms |
| Channels | – | 2 channels | – |
| Electrodes | Fz, Cz (active); M1 and M2 (reference) ≤5 kΩ (individual); ≤2 kΩ (between electrodes) | Cz (reference), Fpz (ground), M2 and M1 (active) | 5 electrodes – impedance ≤5 kΩ |
| Filters | 1–30 Hz | 30.00–1.00 Hz | 1–30 Hz |
| Signal amplification | – | – | – |
| Sampling | – | 300 | 1000 |
| Patient status | Alert/attentive | Attentive | Attentive |