| Title: | Coding of odour and space in the hemimetabolous insect Periplaneta americana |
| Author(s): | Paoli M; Nishino H; Couzin-Fuchs E; Galizia CG; |
| Address: | "Department of Neuroscience, University of Konstanz, 78457 Konstanz, Germany giovanni.galizia@uni-konstanz.de marco.paoli@uni-konstanz.de. Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan. Department of Neuroscience, University of Konstanz, 78457 Konstanz, Germany" |
| ISSN/ISBN: | 1477-9145 (Electronic) 0022-0949 (Linking) |
| Abstract: | "The general architecture of the olfactory system is highly conserved from insects to humans, but neuroanatomical and physiological differences can be observed across species. The American cockroach, inhabiting dark shelters with a rather stable olfactory landscape, is equipped with long antennae used for sampling the surrounding air-space for orientation and navigation. The antennae's exceptional length provides a wide spatial working range for odour detection; however, it is still largely unknown whether and how this is also used for mapping the structure of the olfactory environment. By selectively labelling antennal lobe projection neurons with a calcium-sensitive dye, we investigated the logic of olfactory coding in this hemimetabolous insect. We show that odour responses are stimulus specific and concentration dependent, and that structurally related odorants evoke physiologically similar responses. By using spatially confined stimuli, we show that proximal stimulations induce stronger and faster responses than distal ones. Spatially confined stimuli of the female pheromone periplanone B activate a subregion of the male macroglomerulus. Thus, we report that the combinatorial logic of odour coding deduced from holometabolous insects applies also to this hemimetabolous species. Furthermore, a fast decrease in sensitivity along the antenna, not supported by a proportionate decrease in sensillar density, suggests a neural architecture that strongly emphasizes neuronal inputs from the proximal portion of the antenna" |
| Keywords: | "Animals Arthropod Antennae/*physiology Odorants Olfactory Perception/*physiology Orientation, Spatial/*physiology Periplaneta/*physiology Visual Perception/*physiology Antennal lobe Calcium imaging Cockroach Insects Odour coding Olfaction;" |
| Notes: | "MedlinePaoli, Marco Nishino, Hiroshi Couzin-Fuchs, Einat Galizia, C Giovanni eng Research Support, Non-U.S. Gov't England 2020/01/15 J Exp Biol. 2020 Feb 3; 223(Pt 3):jeb218032. doi: 10.1242/jeb.218032" |
