Publications by authors named "Jonas Hansen Kymre"

2 Publications

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Distinct protocerebral neuropils associated with attractive and aversive female-produced odorants in the male moth brain.

Elife 2021 May 14;10. Epub 2021 May 14.

Chemosensory lab, Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway.

The pheromone system of heliothine moths is an optimal model for studying principles underlying higher-order olfactory processing. In , three male-specific glomeruli receive input about three female-produced signals, the primary pheromone component, serving as an attractant, and two minor constituents, serving a dual function, that is, attraction versus inhibition of attraction. From the antennal-lobe glomeruli, the information is conveyed to higher olfactory centers, including the lateral protocerebrum, via three main paths - of which the medial tract is the most prominent. In this study, we traced physiologically identified medial-tract projection neurons from each of the three male-specific glomeruli with the aim of mapping their terminal branches in the lateral protocerebrum. Our data suggest that the neurons' widespread projections are organized according to behavioral significance, including a spatial separation of signals representing attraction versus inhibition - however, with a unique capacity of switching behavioral consequence based on the amount of the minor components.
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http://dx.doi.org/10.7554/eLife.65683DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8154038PMC
May 2021

Antennal-lobe neurons in the moth Helicoverpa armigera: Morphological features of projection neurons, local interneurons, and centrifugal neurons.

J Comp Neurol 2021 May 5;529(7):1516-1540. Epub 2020 Oct 5.

Chemosensory lab, Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway.

The relatively large primary olfactory center of the insect brain, the antennal lobe (AL), contains several heterogeneous neuronal types. These include projection neurons (PNs), providing olfactory information to higher-order neuropils via parallel pathways, and local interneurons (LNs), which provide lateral processing within the AL. In addition, various types of centrifugal neurons (CNs) offer top-down modulation onto the other AL neurons. By performing iontophoretic intracellular staining, we collected a large number of AL neurons in the moth, Helicoverpa armigera, to examine the distinct morphological features of PNs, LNs, and CNs. We characterize 190 AL neurons. These were allocated to 25 distinct neuronal types or sub-types, which were reconstructed and placed into a reference brain. In addition to six PN types comprising 15 sub-types, three LN and seven CN types were identified. High-resolution confocal images allowed us to analyze AL innervations of the various reported neurons, which demonstrated that all PNs innervating ventroposterior glomeruli contact a protocerebral neuropil rarely targeted by other PNs, that is the posteriorlateral protocerebrum. We also discuss the functional roles of the distinct CNs, which included several previously uncharacterized types, likely involved in computations spanning from multisensory processing to olfactory feedback signalization into the AL.
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http://dx.doi.org/10.1002/cne.25034DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8048870PMC
May 2021