New studies on odour discrimination in the frog's olfactory receptor cells. I. Experimental results

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Abstract
New experiments were performed within a systematic investigation of the discriminative properties of olfactory receptor cells in the frog. Extracellular spike responses of receptor units were recorded during stimulation with 39 different odorants. Several general properties of the olfactory receptors, already described, were confirmed. The overall selectivity was found to be lower than in previous studies. Enantiomeric forms of citronellol and carvone were discriminated by several receptor cells, mainly in quantitative terms. In a series of eight cycloketones, each compound was the best stimulus for at least one receptor cell and some receptor cells had several ‘best stimuli’. Five odorants were delivered at two concentrations. All the receptors responding to the lowest concentration also responded to the highest one.