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Chemical Senses Advance Access originally published online on December 14, 2005
Chemical Senses 2006 31(2):119-130; doi:10.1093/chemse/bjj013
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Sniffing and Spatiotemporal Coding in Olfaction

John W. Scott

Department of Cell Biology, Emory University, 405N Whitehead Biomedical Research Center, 615 Michael Street, Atlanta, GA 30322, USA

Correspondence to be sent to: John W. Scott, Department of Cell Biology, Emory University, 405N Whitehead Biomedical Research Center, 615 Michael Street, Atlanta, GA 30322, USA. e-mail: johns{at}cellbio.emory.edu

The act of sniffing increases the air velocity and changes the duration of airflow in the nose. It is not yet clear how these changes interact with the intrinsic timing within the olfactory bulb, but this is a matter of current research activity. An action of sniffing in generating a high velocity that alters the sorption of odorants onto the lining of the nasal cavity is expected from the established work on odorant properties and sorption in the frog nose. Recent work indicates that the receptor properties in the olfactory epithelium and olfactory bulb are correlated with the receptor gene expression zones. The responses in both the epithelium and the olfactory bulb are predictable to a considerable extent by the hydrophobicity of odorants. Furthermore, receptor expression in both rodent and salamander nose interacts with the shapes of the nasal cavity to place the receptor sensitivity to odorants in optimal places according to the aerodynamic properties of the nose.

Key words: electroolfactogram, flow rate, odorant hydrophobicity, sorption


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