Responses of afferent and efferent neurons to auditory inputs in the vestibular nerve of the frog

Bricout-Berthout, A.; Caston, J.

doi:10.1007/bf00609664

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…In particular, vestibular efferent neurons in fish and amphibians respond to somatosensory inputs produced by passively manipulating the limbs and applying pressure to the skin (goldfish: Hartmann and Klinke, 1980 ; toadfish: Highstein and Baker, 1985 ; frog: Schmidt, 1963 ; salamander: Schmidt, 1965 ). Additionally, there are reports that vestibular efferents can be driven by a visual or auditory stimulation in these two classes of vertebrate (visual—goldfish: Schmidt et al, 1972 ; Hartmann and Klinke, 1980 ; frog: Caston and Bricout-Berthout, 1982 ; auditory—toadfish: Highstein and Baker, 1985 ; frog: Bricout-Berthout and Caston, 1982 ). The above findings in fish and amphibians raise two fundamental questions.…”

Section: Introductionmentioning

confidence: 99%

“…Yet, in this latter vertebrate class, somatosensory stimulation can both inhibit and excite afferents, and thus contrasts with what is seen in fish. Likewise, auditory stimulation can evoke either excitatory or inhibitory responses in individual afferents in amphibians ( Figure 2B ; Bricout-Berthout and Caston, 1982 ). Thus, in answer to the first question, it is clear that both the vestibular and extra-vestibular sensory signals carried by vestibular efferent neurons modify the responses of the vestibular afferents that they target in fish and amphibians and that this resultant modulation is generally excitatory in fish and excitatory or bidirectional in amphibians (see Figure 2 ).…”

Section: Introductionmentioning

confidence: 99%

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Differences in the Structure and Function of the Vestibular Efferent System Among Vertebrates

Cullen

Wei

2021

Front. Neurosci.

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The role of the mammalian vestibular efferent system in everyday life has been a long-standing mystery. In contrast to what has been reported in lower vertebrate classes, the mammalian vestibular efferent system does not appear to relay inputs from other sensory modalities to the vestibular periphery. Furthermore, to date, the available evidence indicates that the mammalian vestibular efferent system does not relay motor-related signals to the vestibular periphery to modulate sensory coding of the voluntary self-motion generated during natural behaviors. Indeed, our recent neurophysiological studies have provided insight into how the peripheral vestibular system transmits head movement-related information to the brain in a context independent manner. The integration of vestibular and extra-vestibular information instead only occurs at next stage of the mammalian vestibular system, at the level of the vestibular nuclei. The question thus arises: what is the physiological role of the vestibular efferent system in mammals? We suggest that the mammalian vestibular efferent system does not play a significant role in short-term modulation of afferent coding, but instead plays a vital role over a longer time course, for example in calibrating and protecting the functional efficacy of vestibular circuits during development and aging in a role analogous the auditory efferent system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Differences in the Structure and Function of the Vestibular Efferent System Among Vertebrates

Cullen

Wei

2021

Front. Neurosci.

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“…The BP fibers are all tuned to a species-specific narrow or single frequency region, and these fibers are always tuned to frequencies higher than those of the AP, although some crossover has been shown (Feng et al, 1975;Capranica, 1977). No efferent innervation, two-tone suppression, significant phase locking or Distortion products have been observed in the BP (Bricout-Berthout & Caston, 1982;Hillery & Narins, 1984;Ronken, 1990;Rossi, et al, 1980;Schmitz, et al, 1992). The fluid path and hair cell displacement in the anuran inner ear is not entirely clear.…”

Section: Basilar Papillla Morpholoandymentioning

confidence: 99%

Independent Acoustic Stimulation of the Amphibian and Basilar Papillae of Rana pipiens

Parker¹

2000

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This study attempted to selectively stimulate and record from either the amphibian or basilar papillae of Rana pipiens. Computer-generated, frequency-specific clicks were used to elicit BSER's from either amphibian or basilar papillae. Narrowband noise fatiguers were presented in the frequency region of which each papillae are tuned. It was expected that a threshold shift would be elicited in the papillae that received the acoustic trauma, and that no threshold shift would be observed from the collateral papilla. The results of this experiment indicated that there was no overall difference between the threshold shift of either papilla. Furthermore, the amount of AP threshold shift was relatively constant regardless of whether the fatiguer bandwidth was overloading the amphibian or basilar papillae. By contrast, the amount of BP threshold shift was greater when proceeded by a fatiguer with a bandwidth corresponding to the BP tuning region than by a fatiguer with a bandwidth corresponding to the AP tuning region. Additionally, curare maximized the amount of BP threshold shift following fatiguing noise presented with a bandwidth to which the AP is tuned.

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Curare and the Efferent Vestibular System: An Electrophysiological Study in the Frog

Caston¹,

Roussel²

1984

Acta Oto-Laryngologica

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In the frog we have studied the action of d-tubocurarine on the spontaneous discharge recorded from the whole horizontal semicircular canal (HC) nerve and from single HC afferent fibres. Gross activity was recorded in isolated head preparations. In each case, the spontaneous frequency was measured 6 min before and 16 min after a drop of D-tubocurarine (0.1 microliter, 5.10(-6)M) dissolved in Ringer or after a similar drop of Ringer was injected into the perilymph near the HC ampulla. Curare elicited a significant increase of the discharge frequency in about 60% of the preparations and a decrease in 6-8% of the cases, whether the contralateral eighth nerve was cut or not, while Ringer had no effect. After severing of the ipsilateral eighth nerve anterior branch, curare had no significant effect on the mean resting rate (calculated from 25 preparations), while in a few cases it evoked an increase or a decrease of the discharge frequency. Single afferent discharges were recorded in intact frogs. The mean frequency calculated from about 200 afferent fibres was 21.4 +/- 1.7 spikes/s after curare treatment, while it was only 15.6 +/- 1.3 spikes/s after Ringer injection; these two values are highly significantly different. From these results we conclude that the ampullary receptors are tonically subject to an inhibitory influence probably due to the tonic activity of the cholinergic efferent vestibular system. Moreover, the activity of the hair cells is probably also controlled by another, as yet unknown cholinergic mechanism.

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Responses of afferent and efferent neurons to auditory inputs in the vestibular nerve of the frog

Cited by 3 publications

References 25 publications

Differences in the Structure and Function of the Vestibular Efferent System Among Vertebrates

Differences in the Structure and Function of the Vestibular Efferent System Among Vertebrates

Independent Acoustic Stimulation of the Amphibian and Basilar Papillae of Rana pipiens

Curare and the Efferent Vestibular System: An Electrophysiological Study in the Frog

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