Activity of central neurons of the electroreceptor system ofGlyptosternum reticulatum

Andrianov, Yu. N.; Broun, G. R.; Mamadaliev, A. M.; Supichakov, Kh. Ya.

doi:10.1007/bf01060119

Neurophysiology

1983

DOI: 10.1007/bf01060119

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Activity of central neurons of the electroreceptor system ofGlyptosternum reticulatum

Yu. N. Andrianov¹,

G. R. Broun²,

A. M. Mamadaliev³

et al.

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2005

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Cited by 1 publication

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“…This applies to the threshold sensitivity, general response pattern related to the presence of on-and off-responses, and dependence of latent time of responses on the duration of stimuli [7,8]. An increased latent time of responses in these experiments, compared to the responses of electroreceptors, may be accounted for by an additional temporal delay due to the efferent pathway.…”

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confidence: 89%

Responses of the Electrogeneration System of Synodontis (Mochokidae, Siluriformes) to Weak Electric Fields

Орлов

Барон

2005

Dokl Biol Sci

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Electric discharges discovered to date in a novel group of weakly electric fish, the mochokid catfish of the genus Synodontis , are of two types. Discharges of the first type are generated spontaneously with a frequency of several pulses per second and are characterized by a very low amplitude, which does not exceed several hundreds of microvolts [1,2]. Discharges of the other type occur irregularly and are related predominantly with aggressive behavior of catfish; their amplitudes are considerably greater and may reach several tens of millivolts [3,4].The functional and possible behavioral roles of electric discharges of synodonts remain obscure. However, taking into account the spectrum of discharges and the range of frequency perception of ampullary electroreceptors of catfish, it was assumed that they may fulfil the communicative function [2,3,5], similarly to African weakly electric Mormyriformes. It is known that the electrogeneration system of the latter is functionally adapted for functioning together with electroreceptors. For instance, any electric stimulus perceived by electroreceptors (including the discharges of electric organs of conspecific individuals) causes a rapid change in the frequency (the sequence of temporal intervals) of generated discharges. This fact underlies the common method of determination of the threshold sensitivity of electroreceptors of mormyrid fish and study of functional characteristics of their electrocommunication system [6].Preliminary experiments performed with Synodontis sp. exhibiting spontaneous microvolt-scale electric activity showed that the sequences of temporal intervals of electric discharges can also change under exposure to external electric stimuli with a strength of 150 µ V/cm [2]. The goal of this work was to study the response of the electrogeneration system of Synodontis upon stimulation of electroreceptors with homogeneous electric field of various duration, strength, and frequency.Experiments were performed with three Synodontis sp. exhibiting spontaneous electric activity. The fish were kept in 40-l aerated aquariums at 25 ° C. During experiments, Synodontis were constantly kept within a porous ceramic tube with open ends. Stimulation with homogeneous electric field was performed through stainless steel plates fixed on aquarium walls, with rectangle pulses of varying durations and amplitude using an isolating adapter with autonomous supply and photon-coupled isolating device. In all experiments, the vector of electric-field strength was perpendicular to the longitudinal axis of fish. The electric-field strength in the tube could varied in the range from 1 to 200 µ V/cm and was regulated by a pair of output electrodes. Electric discharges were diverted by means of carbon electrodes inserted along the longitudinal axis of the tube to suppress the artifact of stimulus. Signals were amplified using a differentiating amplifier with a frequency range of 5Hz to 15 kHz; they were first formed in a Nokia LPB 4915 window discriminator. To construct interpulse-in...

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confidence: 89%

Responses of the Electrogeneration System of Synodontis (Mochokidae, Siluriformes) to Weak Electric Fields

Орлов

Барон

2005

Dokl Biol Sci

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Activity of central neurons of the electroreceptor system ofGlyptosternum reticulatum

Cited by 1 publication

References 7 publications

Responses of the Electrogeneration System of Synodontis (Mochokidae, Siluriformes) to Weak Electric Fields

Responses of the Electrogeneration System of Synodontis (Mochokidae, Siluriformes) to Weak Electric Fields

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