Olfaction and Taste. Proceedings of the First International by Y. Zotterman (Eds.)

By Y. Zotterman (Eds.)

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Additional resources for Olfaction and Taste. Proceedings of the First International Symposium Held at the Wenner–Gren Center, Stockholm, September 1962

Sample text

It is important to stress the significance of using very low stimulus intensities. 2 ml of odorized air lasting 1 sec with the syringe tip 3 cm from the mucosa will typically evoke a larger response from a unit that is sensitive to the particular odor. When stimulus strengths are so large that two successive puffs cause a decrement in the amplitude of the slow potential, the receptors will certainly be in either a generally irritable or a blocked state, and no longer odor-selective. The EOG or Ottoson potential was monitored by a micropipette filled with 3m KC1 touching the surface of the mucosa, usually at the top of the eminentia olfactoria.

C. GESTELAND AND OTHERS that whether a receptor responds or not depends on the relative occupa­ tion of the different sites, or on occupation of a minimum number of sites of more than one type. Some sites could be inhibitory, but it is not neces­ sary to postulate this in order to have a useful code without great numbers of different cell species. At present, the fourth receptor model seems the most compatible with our data, but we are in no position to settle the question yet. SUMMARY 1. A new recording technique that allows the action potentials of single primary olfactory receptors in the frog to be recorded extracellularly has been described.

Sweep lengths, 10 sec. 27 28 R. C. GESTELAND AND OTHERS FIG. 8. Two units show vigorous responses to ethyl butyrate and w-butanol. Vigorous response of a different larger unit and one of the smaller units to musk xylene. Weak response of the larger unit to geraniol. Sweep lengths, 10 sec. FIG. 9. Two units of different amplitude are active in these three traces. One responds to none of the three stimuli. The other responds vigorously to coumarin, and weakly or not at all to camphor and w-butanol.

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