title: A behavior-based circuit model of how outcome expectations organize learned behavior in larval Drosophila.
abstract: Drosophila larvae combine a numerically simple brain, a correspondingly moderate behavioral complexity, and the availability of a rich toolbox for transgenic manipulation. This makes them attractive as a study case when trying to achieve a circuit-level understanding of behavior organization. From a series of behavioral experiments, we suggest a circuitry of chemosensory processing, odor-tastant memory trace formation, and the "decision" process to behaviorally express these memory traces--or not. The model incorporates statements about the neuronal organization of innate vs. conditioned chemosensory behavior, and the types of interaction between olfactory and gustatory pathways during the establishment as well as the behavioral expression of odor-tastant memory traces. It in particular suggests that innate olfactory behavior is responsive in nature, whereas conditioned olfactory behavior is captured better when seen as an action in pursuit of its outcome. It incorporates the available neuroanatomical and behavioral data and thus should be useful as scaffold for the ongoing investigations of the chemo-behavioral system in larval Drosophila.
authors.affiliation: Universität Würzburg, Biozentrum, Neurobiologie und Genetik, Am Hubland, 970 74 Würzburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Schleyer
authors.forename: Timo
authors.initials: T
authors.lastname: Saumweber
authors.forename: Wiebke
authors.initials: W
authors.lastname: Nahrendorf
authors.forename: Benjamin
authors.initials: B
authors.lastname: Fischer
authors.forename: Désirée
authors.initials: D
authors.lastname: von Alpen
authors.forename: Dennis
authors.initials: D
authors.lastname: Pauls
authors.forename: Andreas
authors.initials: A
authors.lastname: Thum
authors.forename: Bertram
authors.initials: B
authors.lastname: Gerber
mesh_terms: D020003:1-Octanol / Q000494:pharmacology; D000818:Animals; D059031:Anticipation, Psychological; D001070:Appetitive Behavior / Q000187:drug effects / Q000502:physiology; D001362:Avoidance Learning / Q000502:physiology; D001547:Benzaldehydes / Q000494:pharmacology; D001921:Brain / Q000254:growth & development / Q000502:physiology; D002628:Chemoreceptor Cells / Q000502:physiology; D004331:Drosophila melanogaster / Q000254:growth & development / Q000502:physiology*; D005247:Feeding Behavior / Q000187:drug effects / Q000502:physiology*; D005518:Food Preferences / Q000187:drug effects; D007814:Larva; D008568:Memory / Q000502:physiology; D008959:Models, Neurological; D024521:Mushroom Bodies / Q000502:physiology; D009812:Odorants; D000439:Pentanols / Q000494:pharmacology; D012054:Reinforcement, Psychology; D012903:Smell / Q000502:physiology*; D013649:Taste / Q000187:drug effects / Q000502:physiology*
chemical_list: D001547:Benzaldehydes; D000439:Pentanols; C005716:amyl acetate; D020003:1-Octanol; C032175:benzaldehyde