... negative wave. The total energy and waveform effects appeared to be additive. These results indicate that G. carapo discriminates complex impedance based on an evaluation of different waveform parameters. Eighteen sexually undifferentiated Gymnotus carapo L., 12-25 cm in length, were used in this study...

...-mail: [email protected] ) 10 12 2002 © The Company of Biologists Limited 2003 2003 contrast discrimination contrast adaptation electric fish Gymnotus carapo fovea short term memory sensory representation In conclusion, we propose the following hypothesis to explain the sensory...

... of the gymnotid fish Gymnotus carapo . An experimental animal rested in a cage and two electrodes were placed at a close distance to its trunk and tail. An electronic switch briefly connected these electrodes during a selected phase within an EOD and the shunting of EOD current that resulted from switch closure...

... sensory stimuli. The gymnotid Gymnotus carapo was induced to pause its EODs briefly, and the novelty response to sensory stimuli given post-pause was analyzed. Mechanosensory stimuli given as early as 20 EODs after a pause elicited clear novelty responses, but strong high-frequency electrical stimuli were...

...Pedro A. Aguilera; María E. Castelló; Angel A. Caputi ABSTRACT Local electric fields generated by the electric organ discharge of Gymnotus carapo were explored at selected points on the skin of an emitter fish (‘local self-generated fields’) and on the skin of a conspecific (‘local conspecific...

...María E. Castelló; Pedro A. Aguilera; Omar Trujillo-Cenóz; Angel A. Caputi ABSTRACT This paper describes the peripheral mechanisms involved in signal processing of self- and conspecific-generated electric fields by the electric fish Gymnotus carapo . The distribution of the different types...

... of intact Gymnotus carapo was experimentally interrupted to investigate how this pausing affects post-pause electric organ discharges. In particular, an analysis was conducted of how the amplitude and relative timing of the three major deflections of the complex discharge change over the course of the first...

... the movements of two species in experiments with approaches to stationary dipoles that are either silenced or jumped to a new direction during an approach. Gymnotus carapo fail to find an electrode source in trials in which the dipole electrode is switched off in mid-track. They slow their approach, become...