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A psychophysical test of the vibration theory of olfaction - Nature Neuroscience

  • ️Vosshall, Leslie B
  • ️Sun Mar 21 2004

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Acknowledgements

We thank A. Gilbert for expert advice, members of the Vosshall laboratory for comments on the manuscript, and E. Gotschlich, B. Coller and the staff of the Rockefeller University Hospital. A.K. is an M.S. Stoffel Fellow in Mind, Brain and Behavior.

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Authors and Affiliations

  1. Laboratory of Neurogenetics and Behavior, The Rockefeller University, 1230 York Avenue, Box 63, New York, 10021, New York, USA

    Andreas Keller & Leslie B Vosshall

Authors

  1. Andreas Keller

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  2. Leslie B Vosshall

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Corresponding author

Correspondence to Andreas Keller.

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Competing interests

The authors declare no competing financial interests.

Supplementary information

Supplementary Fig. 1.

Additive synthesis. Turin suggests that the smell of a mixture of guaiacol and benzaldehyde has a vanilla character not found in its components because the combined molecular vibrations of benzaldehyde and guaiacol roughly approximate the vibrations of vanillin. (a) To test this prediction, subjects rated the vanilla character of benzaldehyde, guaiacol and a 1:1 mixture of both. This is the same experiment as in Fig. 1b but done at lower stimulus concentration (10-4). The benzaldehyde/guaiacol mixture had a vanilla character no stronger than either of its components (N=24, 12 females, 12 males, middle line: median, box boundaries and whiskers: 25%, 75% and 10% and 90% quantiles, respectively; P > 0.05; Student-Newman-Keuls test for multiple comparisons after Friedman's test). (b) In another version of this experiment, odor similarity was rated on a scale from 0 (smells the same) to 10 (smells very different). Subjects did not rate the 1:1 mixture of undiluted benzaldehyde and guaiacol more similar to undiluted vanillin than each individual component of the mixture. The vanillin vs. components and the mixture vs. components values include the comparison between vanillin or the mixture and both benzaldehyde and guaiacol (N=36, 22 females, 14 males) (P > 0.05; Student-Newman-Keuls test for multiple comparisons after Friedman's test). (JPG 37 kb)

Supplementary Fig. 2.

Odor similarity rating of aldehydes. Vibration theory, as formulated by Turin, suggests that aldehydes with an even number of carbon atoms smell different from those with an odd number. We had subjects rate pairs of undiluted aldehydes with eight to eleven carbon atoms for perceived smell dissimilarity. The results show that within-pair smell dissimilarity increased along with the difference in carbon atom number. Odor dissimilarity was rated on a scale from 0 (smells the same) to 10 (smells very different). The three carbon atoms difference includes the pair octanal/undecanal, the two carbon difference includes octanal/decanal and nonanal/undecanal, the one carbon difference octanal/nonanal, nonanal/decanal, and decanal/undecanal (N=36, 22 females, 14 males, middle line: median, box boundaries and whiskers: 25%, 75% and 10% and 90% quantiles, respectively). (JPG 31 kb)

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Keller, A., Vosshall, L. A psychophysical test of the vibration theory of olfaction. Nat Neurosci 7, 337–338 (2004). https://doi.org/10.1038/nn1215

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  • Received: 18 December 2003

  • Accepted: 21 January 2004

  • Published: 21 March 2004

  • Issue Date: 01 April 2004

  • DOI: https://doi.org/10.1038/nn1215