Abstract
1. Receptor cell activity in the frog's eminentia olfactoria was recorded using metal-filled micro-electrodes. 2. Several units discharged spontaneously with a mean frequency lower than 0.2 spikes per sec, or were silent in periods of up to 5 min. The other units displayed spontaneous activities between 0.2 and 1.05 spikes per sec; their activity could be modelled with a Poisson process. 3. Near-threshold responses to odour stimulation were investigated, considering several stimulations within a small concentration range. Low concentration stimulations were sometimes followed by a response, sometimes not. The concept of response probability is introduced to describe this incertitude. 4. The distribution of the number of spikes in several odour trials at low concentrations showed a reasonable agreement with two types of Poisson distribution. 5. The findings are discussed in connexion with receptor cell sensitivity and the excitation of second order neurones in the bulb.
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Selected References
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- ALLISON A. C., WARWICK R. T. T. Quantitative observations on the olfactory system of the rabbit. Brain. 1949 Jun;72(Pt 2):186–197. doi: 10.1093/brain/72.2.186. [DOI] [PubMed] [Google Scholar]
- Getchell T. V. Unitary responses in frog olfactory epithelium to sterically related molecules at low concentrations. J Gen Physiol. 1974 Aug;64(2):241–261. [PMC free article] [PubMed] [Google Scholar]
- Müller K., Kiepenheuer J. Olfactory orientation in frogs. Naturwissenschaften. 1976 Jan;63(1):49–50. doi: 10.1007/BF00768696. [DOI] [PubMed] [Google Scholar]
- O'Connell R. J., Mozell M. M. Quantitative stimulation of frog olfactory receptors. J Neurophysiol. 1969 Jan;32(1):51–63. doi: 10.1152/jn.1969.32.1.51. [DOI] [PubMed] [Google Scholar]