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Chemical Senses Advance Access published online on March 1, 2006
Chemical Senses, doi:10.1093/chemse/bjj040
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org
Accepted January 31, 2006

Article

Temporal Integrity of an Airborne Odor Stimulus is Greatly Affected by Physical Aspects of the Odor Delivery System

Richard S. Vetter 1, Amy E. Sage 1, Kristine A. Justus 1, Ring T. Cardé 1, and C. Giovanni Galizia 2 *

1 Department of Entomology, University of California, Riverside, CA 92521, USA
2 Department of Entomology, University of California, Riverside, CA 92521, USA; Universität Konstanz, D-78457 Konstanz, Germany

* To whom correspondence should be addressed.
C. Giovanni Galizia, E-mail: giovanni.galizia{at}uni-konstanz.de


  Abstract

There is currently a debate about the role played by temporal patterns in neural activity in olfactory coding. An accurate analysis of this question, however, is only possible if the temporal properties of a stimulus itself are well defined. So far, no technique with sufficient temporal resolution has been available to accomplish this. Using a photoionization detector (PID), we show that the configuration of the odor delivery apparatus and the airflow settings greatly influence the integrity of a stimulus profile within an odor delivery apparatus. In a situation where pulsatile odor stimuli are applied to a stationary preparation, we tested the effect of 1) axial and off-center location within the airstream, 2) airflow of the odor delivery, 3) exit tube length, 4) exit tube diameter, 5) orientation of the odor delivery device in relation to the exhaust flow, and 6) exhaust tube air speed. This has important implications for the study of time in olfaction; significant planning must be incorporated into the design of the experiment to provide a well-defined odor delivery system.

Keywords: odor delivery; olfactometer; photoionization detector; temporal patterns; turbulence.
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