Electrophysiological study of central projections of ampullae of lorenzini in skates

Andrianov, Yu. N.; Broun, G. R.; Ilʹinskiĭ, O. B.; Muraveiko, V. M.

doi:10.1007/bf01066120

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…The responses of DON neurons reported in this study bear a number of similarities to those in previous studies by Adrianov et al (1974Adrianov et al ( , 1983. The ALLN fiber responses resemble those reported by Adrianov as purely tonic responses.…”

Section: Discussionsupporting

confidence: 87%

“…Previous studies in elasmobranchs have noted the apparently uniform cathodal excitability of ALLN fibers and DON neurons (Adrianov et al , 1983Akoev et al 1976;Broun et al 1979;Montgomery 1984a, b). However, these studies have generally employed uniform electric field stimuli rather than local fields.…”

Section: Discussionmentioning

confidence: 88%

“…Although several studies have described responses of DON neurons to electric field stimuli (Adrianov et al , 1983Brown et al 1974;Montgomery 1984a, b), a systematic study of these responses to discrete, localized, and consistently presented stimuli remains to be performed. The purpose of this study is to determine whether neurons within the DON can be segregated into functional categories by the nature of their responses to discrete electric field stimuli presented in a consistent manner within their receptive fields.…”

Section: Introductionmentioning

confidence: 99%

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Medullary electrosensory processing in the little skate

New

1990

J Comp Physiol A

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1. Ampullary electroreceptors in elasmobranchs are innervated by fibers of the ALLN, which projects to the dorsal octavolateralis nucleus (DON). The purpose of this study is to examine the response characteristics of ALLN fibers and DON neurons to weak D.C. and sinusoidal electric field stimuli presented as local dipole fields. 2. ALLN fibers respond to presentation of D.C. fields with a phasic burst, followed by a more slowly adapting period of firing. Ascending efferent neurons (AENs) in the DON respond to stimuli with a similar initial burst, which adapts more quickly. 3. Type 1, 2, and 3 neurons are possible local interneurons or commissural DON neurons. Type 1 neurons demonstrate response properties similar to those of AENs. Type 2 cells demonstrated slowly adapting responses to excitatory stimuli, the duration of the response increased with the amplitude of the stimulus. Type 3 neurons demonstrated an increased rate of firing, but the response lacked any specific temporal characteristics. 4. ALLN fibers typically have receptive fields consisting of a single ampulla. The receptive field sizes of DON neurons exhibited varying degrees of convergence for different cell types. 5. Responses of ALLN fibers and DON neurons to weak sinusoidal stimuli demonstrated very similar frequency response characteristics for all cell types. The peak sensitivity of electrosensory neurons was between 5-10 Hz.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Medullary electrosensory processing in the little skate

New

1990

J Comp Physiol A

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“…Later, Bodznick (Bodznick, 1991) found a topographic map of electrosensory receptive fields in the tectum of a skate. Single unit responses have been recorded in the midbrain of elasmobranchs (Andrianov et al, 1984;Schweitzer, 1986), the torus semicircularis of catfish (Knudsen, 1976a;Knudsen, 1976b;Knudsen, 1978), and the tectum of a urodele, the axolotl (Bartels et al, 1990). However, these studies were mainly aimed at demonstrating the presence of electrosensory information in the midbrain and its topographic representation in the tectum.…”

Section: Introductionmentioning

confidence: 99%

Response properties of electrosensory units in the midbrain tectum of the paddlefish (Polyodon spathula Walbaum)

Hofmann

Jung

Siebenaller

et al. 2008

Journal of Experimental Biology

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Functional organization of the electroreceptive midbrain in an elasmobranch (Platyrhinoidis triseriata)

Schweitzer

1986

J. Comp. Physiol.

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The response properties of 322 single units in the electroreceptive midbrain (lateral mesencephalic nucleus, LMN) of the thornback ray, Platyrhinoidis triseriata, were studied using uniform and local electric fields. Tactile, visual, or auditory stimuli were also presented to test for multimodality. Most LMN electrosensory units (81%) are silent in the absence of stimulation. Those with spontaneous activity fired irregularly at 0.5 to 5 impulses/s, the lower values being more common. Two units had firing rates greater than 10/s. Midbrain electrosensory units are largely phasic, responding with one or a few spikes per stimulus onset or offset or both, but the adaptation characteristics of some neurons are complex. The same neuron can exhibit phasic or phasic-tonic responses, depending upon orientation of the electric field. Tonic units without any initial phasic over-shoot were not recorded. Even the phasic-tonic units adapt to a step stimulus within several seconds. Unit thresholds are generally lower than 0.3 microV/cm, the weakest stimulus delivered, although thresholds as high as 5 microV/cm were recorded, Neuronal responses reach a maximum, with few exceptions, at 100 microV/cm and decrease rapidly at higher intensities. LMN neurons are highly sensitive to stimulus repetition rates: most responded to frequencies of 5 pulses/s or less; none responded to rates greater than 10/s. Three distinct response patterns are recognized. Best frequencies in response to sinusoidal stimuli range from 0.2 Hz (the lowest frequency delivered) to 4 Hz. Responses decrease rapidly at 8 Hz or greater, and no units responded to frequencies greater than 32 Hz. Most LMN neurons have small, well defined excitatory electroreceptive fields (RFs) exhibiting no surround inhibition, at least as detectable by methods employed here. Seventy-eight percent of units recorded had RFs restricted to the ventral surface: of these, 98% were contralateral. The remaining 22% of units had disjunct dorsal and ventral receptive fields. Electrosensory RFs on the ventral surface are somatotopically organized. Anterior, middle, and posterior body surfaces are mapped at the rostral, middle, and caudal levels, respectively, of the contralateral LMN. The lateral, middle, and medial body are mapped at medial, middle, and lateral levels of the nucleus. Moreover, the RFs of all units isolated in a given dorsoventral electrode track are nearly superimposable. About 40% of LMN, measured from the dorsal surface, is devoted to input from ventral electroreceptors located in a small region rostral and lateral to the mouth.(ABSTRACT TRUNCATED AT 400 WORDS)

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Electrophysiological study of central projections of ampullae of lorenzini in skates

Cited by 5 publications

References 7 publications

Medullary electrosensory processing in the little skate

Medullary electrosensory processing in the little skate

Response properties of electrosensory units in the midbrain tectum of the paddlefish (Polyodon spathula Walbaum)

Functional organization of the electroreceptive midbrain in an elasmobranch (Platyrhinoidis triseriata)

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