Abstract
Insects live in a complex olfactory environment containing thousands of volatile organic compounds (olfactory stimuli) at various intensities and mixture proportions, yet insects can detect and respond to specific olfactory stimuli at millisecond timescales. In this chapter, we describe the mechanisms by which the insect olfactory system can efficiently process an olfactory stimulus and how it filters the signal from background noise. Highlighting recent results from a variety of insect species, we consider: (1) the nature of the olfactory environment, (2) how olfactory information is filtered in the periphery, and (3) how the central nervous system efficiently and adaptively processes olfactory information. We propose that plasticity encoded in state- and learning-related processes allows the insect olfactory system to process and distinguish olfactory signals efficiently from background and to allow both the large-scale (e.g., meaning or value) and fine-scale (e.g., identity and composition) features of a stimulus to be encoded.
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Abbreviations
- AL:
-
Antennal lobe
- GABA:
-
γ-Aminobutyric acid
- GC:
-
Gas chromatography
- GC-EAD:
-
Gas chromatography coupled with electroantennographic detection
- iLPN:
-
Interneuron in the lateral protocerebrum
- LN:
-
Local interneuron
- LP:
-
Lateral protocerebrum
- MB:
-
Mushroom body
- OBP:
-
Odorant binding protein
- OR:
-
Olfactory receptor
- ORC:
-
Olfactory receptor cell
- PN:
-
Projection neuron
- VOC:
-
Volatile organic compound
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Acknowledgments
We thank E. Warrant and G. von der Emde for their invitation to be included in this book. We also thank H. Lei, C. Reisenman, E. Shlizerman, and M. Dickinson for discussions on olfactory filtering and processing. Funding was provided by National Science Foundation (IOS-1354159 and DMS-1361145), the National Institutes of Health (R01DC013693, R01DC02751), and the Human Frontier Science Program (A87616).
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Riffell, J.A., Hildebrand, J.G. (2016). Adaptive Processing in the Insect Olfactory System. In: von der Emde, G., Warrant, E. (eds) The Ecology of Animal Senses. Springer, Cham. https://doi.org/10.1007/978-3-319-25492-0_1
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