Abstract
Using a three-alternative forced-choice ascending staircase procedure, we determined olfactory detection thresholds in 20 human subjects for seven aromatic aldehydes and compared them to those of four spider monkeys tested in parallel using an operant conditioning paradigm. With all seven odorants, both species detected concentrations <1 ppm, and with several odorants single individuals of both species even discriminated concentrations <1 ppb from the solvent. No generalizable species differences in olfactory sensitivity were found despite marked differences in neuroanatomical and genetic features. The across-odorant patterns of sensitivity correlated significantly between humans and spider monkeys, and both species were more sensitive to bourgeonal than to lilial, cyclamal, canthoxal, helional, lyral, and 3-phenylpropanal. No significant correlation between presence/absence of an oxygen-containing moiety attached to the benzene ring or presence/absence of an additional alkyl group next to the functional aldehyde group, and olfactory sensitivity was found in any of the species. However, the presence of a tertiary butyl group in para position (relative to the functional aldehyde group) combined with a lack of an additional alkyl group next to the functional aldehyde group may be responsible for the finding that both species were most sensitive to bourgeonal.
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Acknowledgments
Financial support by the Consejo Nacional de Ciencia y Tecnologia (CONACYT) Mexico to Laura Teresa Hernandez Salazar (J-51435-IV) is gratefully acknowledged. We thank Christian Margot of Firmenich SA, Geneva, Switzerland, and Henry Hansch of International Flavors & Frangrances, New York, USA, for generously providing us with highly purified bourgeonal and lyral, respectively.
The experiments reported here comply with the Guide for the Care and Use of Laboratory Animals (National Institutes of Health Publication no. 86-23, revised 1985) and also with current laws in Mexico, the country in which the tests with the animals were performed.
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Kjeldmand, L., Hernandez Salazar, L.T. & Laska, M. Olfactory sensitivity for sperm-attractant aromatic aldehydes: a comparative study in human subjects and spider monkeys. J Comp Physiol A 197, 15–23 (2011). https://doi.org/10.1007/s00359-010-0580-y
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DOI: https://doi.org/10.1007/s00359-010-0580-y