title: Encoding of social signals in all three electrosensory pathways of Eigenmannia virescens.
abstract: Extracting complementary features in parallel pathways is a widely used strategy for a robust representation of sensory signals. Weakly electric fish offer the rare opportunity to study complementary encoding of social signals in all of its electrosensory pathways. Electrosensory information is conveyed in three parallel pathways: two receptor types of the tuberous (active) system and one receptor type of the ampullary (passive) system. Modulations of the fish's own electric field are sensed by these receptors and used in navigation, prey detection, and communication. We studied the neuronal representation of electric communication signals (called chirps) in the ampullary and the two tuberous pathways of Eigenmannia virescens. We first characterized different kinds of chirps observed in behavioral experiments. Since Eigenmannia chirps simultaneously drive all three types of receptors, we studied their responses in in vivo electrophysiological recordings. Our results demonstrate that different electroreceptor types encode different aspects of the stimuli and each appears best suited to convey information about a certain chirp type. A decoding analysis of single neurons and small populations shows that this specialization leads to a complementary representation of information in the tuberous and ampullary receptors. This suggests that a potential readout mechanism should combine information provided by the parallel processing streams to improve chirp detectability.
authors.affiliation: Department Biology II, Ludwig-Maximilians-Universität München, Munich, Germany; Department of Biology, Lund University, Lund, Sweden;
authors.forename: Anna
authors.initials: A
authors.lastname: Stöckl
authors.affiliation: Institut für Neurobiologie, Eberhardt Karls Universität Tübingen, Tübingen, Germany; and Bernstein Center for Computational Neuroscience, Tübingen, Germany.
authors.forename: Fabian
authors.initials: F
authors.lastname: Sinz
authors.affiliation: Department Biology II, Ludwig-Maximilians-Universität München, Munich, Germany; Institut für Neurobiologie, Eberhardt Karls Universität Tübingen, Tübingen, Germany; and.
authors.forename: Jan
authors.initials: J
authors.lastname: Benda
authors.affiliation: Department Biology II, Ludwig-Maximilians-Universität München, Munich, Germany; Institut für Neurobiologie, Eberhardt Karls Universität Tübingen, Tübingen, Germany; and jan.grewe@uni-tuebingen.de.
authors.forename: Jan
authors.initials: J
authors.lastname: Grewe
mesh_terms: D000200:Action Potentials; D000344:Afferent Pathways; D000818:Animals; D004557:Electric Organ / Q000502:physiology*; D023702:Gymnotiformes / Q000502:physiology*; D008959:Models, Neurological; D012919:Social Behavior
keywords: communication; decoding; parallel processing; sensory coding; weakly electric fish