Factors Influencing Odor Sensitivity in the Dog
PENNSYLVANIA UNIV PHILADELPHIA MONELL CHEMICAL SENSES CENTER
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Detection curves for alpha-ionone for four dogs were derived using an automated odor-choice apparatus. Factors critical for maximizing, stabilizing, and evaluating performance of both dog and odor delivery system were identified. These include use of a descending and not ascending concentration series, minimizing decrements between successive dilution steps, use of criterion of stability of performance based on achieving low variance. Six human subjects were tested on the same apparatus. The dog could detect alpha-ionone at 3-4 and one half log units lower than could human subjects. Detection curves consist of two segments with markedly differing slopes. The discontinuity occurs at high performance levels suggesting the possible presence of a dual process at the receptor level. In cyclic female rats trained to detect cyclopentanone performance shows a high correlation with levels of circulating estrogens.
- Anatomy and Physiology