ZDEN.htm

NR ZDEN

AU Voirol,E.; Daget,N.

TI Comparative study of nasal and retronasal olfactory perception

QU Lebensm. Wiss. u. Technol. 1986; 19: 316-9

PT journal article

AB Nasal and retronasal olfactory perception were compared at two levels; perception threshold and supra-threshold concentrations. Three methods of stimulation were used: direct stimulation (sniffing) and indirect stimulation (inhaling the vapour phase or sipping the odorant); The tests were performed with aqueous solutions of two flavours giving the sensation of being a specific taste: citral and vanillin. Perception thresholds, measured ba a sorting method with a triangle presentation, showed that the three pathways of stimulation differ in their efficiency. Sipping the solution, sniffing and inhaling through the mouth give increased thresholds. For supra-threshold intensities, measured by magnitude estimation against 0.05% n-butanol reference, we again found the same trend. The different efficiencies are determined in relation to air flow through the nasal cavity and the temperature of the stimulus. The slope of Stevens' regression lines were identical for sniffing and inhaling, showing that olfactory perception by direct or retronasal pathways involves the same mechanism. For sipping the solution , the slope is rather different due to adaptation or trigeminal stimulation.

SP englisch

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