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Synchronous firing of antennal-lobe projection neurons encodes the behaviorally effective ratio of sex-pheromone components in male Manduca sexta

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Abstract

Olfactory stimuli that are essential to an animal’s survival and reproduction are often complex mixtures of volatile organic compounds in characteristic proportions. Here, we investigated how these proportions are encoded in the primary olfactory processing center, the antennal lobe, of male Manduca sexta moths. Two key components of the female’s sex pheromone, present in an approximately 2:1 ratio, are processed in each of two neighboring glomeruli in the macroglomerular complex (MGC) of males of this species. In wind-tunnel flight experiments, males exhibited behavioral selectivity for ratios approximating the ratio released by conspecific females. The ratio between components was poorly represented, however, in the firing-rate output of uniglomerular MGC projection neurons (PNs). PN firing rate was mostly insensitive to the ratio between components, and individual PNs did not exhibit a preference for a particular ratio. Recording simultaneously from pairs of PNs in the same glomerulus, we found that the natural ratio between components elicited the most synchronous spikes, and altering the proportion of either component decreased the proportion of synchronous spikes. The degree of synchronous firing between PNs in the same glomerulus thus selectively encodes the natural ratio that most effectively evokes the natural behavioral response to pheromone.

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Abbreviations

AL:

Antennal lobe

BAL:

Bombykal, (E,Z)-10,12-hexadecadienal

EAG:

Electroantennogram

EEZ:

(E,E,Z)-10,12-14-hexadecatrienal

MGC:

Macroglomerular complex

mPN:

Multi-glomerular projection neuron

ORC:

Olfactory receptor cell

PN:

Projection neuron

uPN:

Uniglomerular projection neuron

VOC:

Volatile organic compound

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Acknowledgments

The authors would like to thank E. Constantopoulos for assistance with behavioral experiments, and A. M. Dacks, C. E. Reisenman, A. Beyerlein, and J. M. Fellous for helpful discussion and comments on this work. This research was supported by the National Institute on Deafness and Other Communication Disorders (NIDCD) grants RO1-DC02751 to JGH and NRSA DC97222 to JPM.

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Correspondence to Joshua P. Martin.

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Martin, J.P., Lei, H., Riffell, J.A. et al. Synchronous firing of antennal-lobe projection neurons encodes the behaviorally effective ratio of sex-pheromone components in male Manduca sexta . J Comp Physiol A 199, 963–979 (2013). https://doi.org/10.1007/s00359-013-0849-z

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  • DOI: https://doi.org/10.1007/s00359-013-0849-z

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