RAT OLFACTORY NERVE RESPONSES TO ODOR

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Abstract
The asynchronous activity from 25 μ bundles of olfactory nerve in six Urethane-anesthetized rats was recorded through 25 μ Pt-Ir hook electrodes. The amplified signal was led into an averaging circuit and permanently recorded. Dilutions of odorous stimuli were provided by an injection-type olfactometer and were delivered to the receptor area of the animal by an artificial sniff device. Response-concentration functions were generated for two pepperminty, two camphoraceous, two floral substances and for n-amyl acetate. The shapes of the response-concentration functions of each qualitative class were significantly different from the functions of the other classes. Indices of effectiveness, relative to n-amyl acetate, indicated that effectiveness was dependent not only on the substance but also on the magnitude of the response. A comparison was drawn between the neural response-concentration function and the rat behavioral detection curve for n-amyl acetate.

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