Odor pairs used for olfactory discrimination testing (cross-habituation testing) and corresponding v/v dilutions (1 Pa)
| Odor pairs | Odors |
|---|---|
| 1 | +Limonene and −Limonene (0.204%) |
| 2 | Pentanol (0.074%) and Butanol (0.021%) |
| 3 | Decanal (1.78%) and (2)-Dodecanone (12.5%) |
| 4 | (+) Limonene (0.204%) and Decanal (1.78%) |
| 5 | Isoamyl acetate (0.05%) and Octanal (0.148%) |
Each pair is composed of perceptually similar odorants (1 to 3) or dissimilar odorants (4 and 5) diluted in mineral oil to have similar vapor pressure.