Two Parallel Olfactory Pathways for Processing General Odors in a Cockroach

Frontiers in Neural Circuits
Hidehiro WatanabeFumio Yokohari

Abstract

In animals, sensory processing via parallel pathways, including the olfactory system, is a common design. However, the mechanisms that parallel pathways use to encode highly complex and dynamic odor signals remain unclear. In the current study, we examined the anatomical and physiological features of parallel olfactory pathways in an evolutionally basal insect, the cockroach Periplaneta americana. In this insect, the entire system for processing general odors, from olfactory sensory neurons to higher brain centers, is anatomically segregated into two parallel pathways. Two separate populations of secondary olfactory neurons, type1 and type2 projection neurons (PNs), with dendrites in distinct glomerular groups relay olfactory signals to segregated areas of higher brain centers. We conducted intracellular recordings, revealing olfactory properties and temporal patterns of both types of PNs. Generally, type1 PNs exhibit higher odor-specificities to nine tested odorants than type2 PNs. Cluster analyses revealed that odor-evoked responses were temporally complex and varied in type1 PNs, while type2 PNs exhibited phasic on-responses with either early or late latencies to an effective odor. The late responses are 30-40 ms later than ...Continue Reading

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Citations

Feb 8, 2020·Scientific Reports·Kosuke TateishiHidehiro Watanabe
Sep 27, 2018·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Harald Tichy, Maria Hellwig
Jan 14, 2021·IScience·Yannick GünzelEinat Couzin-Fuchs
Jan 25, 2021·Cell and Tissue Research·Debora Fuscà, Peter Kloppenburg
Apr 1, 2021·Cognitive Neurodynamics·Pamela B PyzzaDavid Cai
Jan 15, 2020·The Journal of Experimental Biology·Marco PaoliC Giovanni Galizia
Sep 30, 2021·The Journal of Comparative Neurology·Azar MassahMonika Stengl

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Methods Mentioned

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transmission electron microscopy

Software Mentioned

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Amira
Spike
R
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