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Electric fish generate and sense electric fields for navigation and communication. These signals can be energetically costly to produce and can attract electroreceptive predators. To minimize costs, some nocturnally active electric fish rapidly boost the power of their signals only at times of high social activity, either as night approaches or in response(More)
The electric organ cells of Sternopygus generate action potentials whose durations vary over a fourfold range. This variation in action potential duration is the basis for individual variation in a communication signal. Thus, action potential duration must be precisely regulated in these cells. We had observed previously that the inactivation kinetics of(More)
Electric fish of the genus Sternopygus produce a sinusoidal electric organ discharge (EOD) of low frequencies in males, high frequencies in females, and overlapping and intermediate frequencies in juveniles. Correspondingly, the cells of the electric organ, the electrocytes, generate action potentials which are of long duration in mature males, short(More)
Many species of electric fish emit sexually dimorphic electrical signals that are used in gender recognition. In Sternopygus, mature females produce an electric organ discharge (EOD) that is higher in frequency and shorter in pulse duration than that of mature males. EOD pulse duration is determined by ion currents in the electrocytes, and androgens(More)
Weakly electric fish such as Sternopygus macrurus utilize a unique signal production system, the electric organ (EO), to navigate within their environment and to communicate with conspecifics. The electric organ discharge (EOD) generated by the Sternopygus electric organ is quasi-sinusoidal and sexually dimorphic; sexually mature males produce long duration(More)
Premotor interneurons involved in the abdominal positioning behaviors of the crayfish, Procambarus clarkii, were studied intracellularly, along with motoneuron activity, in semi-intact preparations during episodes of fictive behavior. Each impaled cell was tested by injecting depolarizing current and examining the motor output. If a response was evoked then(More)
ii Dedicated to my parents iii ACKNOWLEDGEMENTS I would like to express my sincere appreciation to my advisor Dr. Gu Guoxiang for his valuable academic suggestions and patient guidance throughout the research and preparation of this thesis. His expertise and technical advice deeply influenced me and my work recorded herein. Without his valuable suggestions(More)
ii ACKNOWLEDGEMENTS Firstly, I would like to thank Prof. Dr. Leszek Czarnecki for providing me such an interesting thesis topic and guiding me throughout my work. I would also like to express my regards to Dr. Shahab Mehraeen and Mr. Michael McAnelly for their valuable suggestions. I would like to acknowledge Dr. Jost Goettert from CAMD for providing me(More)
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