The effect of difference frequency on electrocommunication: Chirp production and encoding in a species of weakly electric fish, Apteronotus leptorhynchus

Hupé, Ginette J.; Lewis, John E.; Benda, Jan

doi:10.1016/j.jphysparis.2008.10.013

Cited by 52 publications

(63 citation statements)

References 36 publications

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“…4 and 5), as well as for negative beats. In A. leptorhynchus, however, chirps can have opposing effects on P-unit responses, depending on the beat frequency (Benda et al 2006;Hupé et al 2008;Walz et al 2014). In this species, sexual dimorphism in EOD frequency is very pronounced and EOD frequency is correlated with sex (Dunlap et al 1998).…”

Section: Synchrony Is a Good Code For Chirp Types In P-unitsmentioning

confidence: 91%

“…Hopkins (1974a) shows that chirps during the breeding season are distinctly longer and are produced in higher numbers than outside the season. It is therefore conceivable that shorter EOD interruptions are produced by E. virescens outside of the breeding season and possibly act as negotiation of threat signals similar to type 2 chirps in A. leptorhynchus (Engler and Zupanc 2001;Hupé et al 2008), while long interruptions are produced by males in the context of courtship behavior.…”

Section: A New Chirp Typementioning

confidence: 99%

“…Communication signals (chirps) of E. virescens, unlike those of other species of weakly electric fish, contain both lowand high-frequency components that drive all three electroceptors (Hagedorn and Heiligenberg 1985;Metzner and Heiligenberg 1991;Hupé et al 2008). Studying the neural representation of chirps on the receptor level is therefore important to establish the basis for further studies on electrocommunication in higher brain areas.…”

mentioning

confidence: 99%

“…The resulting AM is a beat that constitutes a background signal on which communication signals occur (e.g., Walz et al 2014). In species in which the EOD frequency exhibits a sexual dimorphism, the nature of the background beat carries information about the type of social encounter (e.g., Apteronotus same-sex vs. different-sex encounter, see for example Hupé et al 2008). In the South-American glass knifefish E. virescens (Sternopygidae, Gymnotiformes) studied here, beats of low frequencies are actively avoided by a change of EOD frequencies in both individuals shifting the beat frequency out of the frequency range used for object detection and navigation.…”

mentioning

confidence: 99%

“…Chirp encoding in P-units of Apteronotus leptorhynchus, a species in which chirps exclusively affect the tuberous system, has been extensively studied in different social encounters, i.e., in different underlying beats (Benda et al 2005(Benda et al , 2006Hupé et al 2008;Marsat and Maler 2010;Vonderschen and Chacron 2011;Walz et al 2014). In Eigenmannia, however, the encoding of EOD interruptions has previously only been assessed in the absence of an EOD of a second fish (Metzner and Heiligenberg 1991).…”

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confidence: 99%

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Encoding of social signals in all three electrosensory pathways ofEigenmannia virescens

Stöckl

Sinz

Benda

et al. 2014

Journal of Neurophysiology

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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.

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Section: Synchrony Is a Good Code For Chirp Types In P-unitsmentioning

confidence: 91%

Section: A New Chirp Typementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Encoding of social signals in all three electrosensory pathways ofEigenmannia virescens

Stöckl

Sinz

Benda

et al. 2014

Journal of Neurophysiology

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Organization of the gymnotiform fish pallium in relation to learning and memory: IV. Expression of conserved transcription factors and implications for the evolution of dorsal telencephalon

Harvey‐Girard

Giassi

Ellis

et al. 2012

J of Comparative Neurology

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We have cloned the apteronotid homologs of FoxP2, Otx1, and FoxO3. There was, in the case of all three genes, good similarity between the apteronotid and human amino acid sequences: FoxP2, 78%; Otx1, 54%; FoxO3, 71%. The functional domains of these genes were conserved to a far greater extent, on average: FoxP2, 89%; Otx1, 76%; FoxO3, 82%. This led us to hypothesize that the cellular functions of these genes might also be conserved. We used in situ hybridization to examine the distribution of the mRNA transcripts of these genes in the apteronotid telencephalon. We confined our analysis to the pallial regions previously associated with learning about social signals, whose circuitry has been closely examined in the other articles of this series. We found that AptFoxP2 and AptOtx1 transcripts were expressed predominantly in the dorsocentral division of the pallium (DC); the dorsolateral division of the pallium (DL) contained only weakly labeled neurons. In both cases, the distribution of labeled neurons was very heterogeneous, and unlabeled neurons could be found adjacent to strongly labeled ones. In contrast, we found that most neurons in DL strongly expressed AptFoxO3 mRNA, although there was only weak expression in a small number of cells within DC. We briefly discuss the relevance of our results regarding the functional roles of AptFoxP2/AptOtx1-expressing neurons in DC for communication vs. foraging behavior. We extensively discuss the implications of our results for possible homologies between DL and DC and medial and dorsal pallium of tetrapods, respectively.

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Organization of the gymnotiform fish pallium in relation to learning and memory: II. Extrinsic connections

Giassi

Duarte

Ellis

et al. 2012

J of Comparative Neurology

141

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This study describes the extrinsic connections of the dorsal telencephalon (pallium) of gymnotiform fish. We show that the afferents to the dorsolateral and dorsomedial pallial subdivisions of gymnotiform fish arise from the preglomerular complex. The preglomerular complex receives input from four clearly distinct regions: (1) descending input from the pallium itself (dorsomedial and dorsocentral subdivisions and nucleus taenia); (2) other diencephalic nuclei (centroposterior, glomerular, and anterior tuberal nuclei and nucleus of the posterior tuberculum); (3) mesencephalic sensory structures (optic tectum, dorsal and ventral torus semicircularis); and (4) basal forebrain, preoptic area, and hypothalamic nuclei. Previous studies have implicated the majority of the diencephalic and mesencephalic nuclei in electrosensory, visual, and acousticolateral functions. Here we discuss the implications of preglomerular/pallial electrosensory-associated afferents with respect to a major functional dichotomy of the electric sense. The results allow us to hypothesize that a functional distinction between electrocommunication vs. electrolocation is maintained within the input and output pathways of the gymnotiform pallium. Electrocommunication information is conveyed to the pallium through complex indirect pathways that originate in the nucleus electrosensorius, whereas electrolocation processing follows a conservative pathway inherent to all vertebrates, through the optic tectum. We hypothesize that cells responsive to communication signals do not converge onto the same targets in the preglomerular complex as cells responsive to moving objects. We also hypothesize that efferents from the dorsocentral (DC) telencephalon project to the dorsal torus semicircularis to regulate processing of electrocommunication signals, whereas DC efferents to the tectum modulate sensory control of movement.

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The effect of difference frequency on electrocommunication: Chirp production and encoding in a species of weakly electric fish, Apteronotus leptorhynchus

Cited by 52 publications

References 36 publications

Encoding of social signals in all three electrosensory pathways ofEigenmannia virescens

Encoding of social signals in all three electrosensory pathways ofEigenmannia virescens

Organization of the gymnotiform fish pallium in relation to learning and memory: IV. Expression of conserved transcription factors and implications for the evolution of dorsal telencephalon

Organization of the gymnotiform fish pallium in relation to learning and memory: II. Extrinsic connections

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