Morphology and Physiology of the Auditory System

Capranica, Robert R.

doi:10.1007/978-3-642-66316-1_17

Cited by 128 publications

(74 citation statements)

References 70 publications

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“…Two inner ear organs, the amphibian and basilar papillae (AP and BP), transduce the resulting fluid movement within the otic capsule. The papillae are innervated by fibers of the eighth nerve (n.VIII), whose cell bodies originate in the acoustic ganglion, and whose axons terminate on cells of the dorsal medullary nucleus (DMN) of the hindbrain (Capranica 1976;Lowe 1986). In Xenopus, the ratio of BP to AP fibers is 0.63, apparently larger than in terrestrial frogs .…”

Section: Introductionmentioning

confidence: 99%

Tone and call responses of units in the auditory nerve and dorsal medullary nucleus of Xenopus laevis

Elliott

Christensen‐Dalsgaard

Kelley

2007

J Comp Physiol A

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The clawed frog Xenopus laevis produces vocalizations consisting of distinct patterns of clicks.This study provides the first description of spontaneous, pure-tone and communication-signal evoked discharge properties of auditory nerve (n.VIII) fibers and dorsal medullary nucleus (DMN) cells in an obligatorily aquatic anuran. Responses of 297 n.VIII and 253 DMN units are analyzed for spontaneous rates (SR), frequency tuning, rate-intensity functions, and firing rate adaptation, with a view to how these basic characteristics shape responses to recorded call stimuli. Response properties generally resemble those in partially terrestrial anurans. Broad tuning exists across characteristic frequencies (CFs). Threshold minima are −101 dB re 1 mm/s at 675 Hz; −87 dB at 1,600 Hz; and −61 dB at 3,000 Hz (−90, −77, and −44 dB re 1 Pa, respectively), paralleling the peak frequency of vocalizations at 1.2-1.6 kHz with ~500 Hz in 3 dB bandwidth. SRs range from 0 to 80 (n.VIII) and 0 to 73 spikes/s (DMN). Nerve and DMN units of all CFs follow click rates in natural calls, ≤67 clicks/s and faster. Units encode clicks with a single spike, double spikes, or bursts. Spike times correlate closely with click envelopes. No temporal filtering for communicative click rates occurs in either n.VIII or the DMN.

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Section: Introductionmentioning

confidence: 99%

Tone and call responses of units in the auditory nerve and dorsal medullary nucleus of Xenopus laevis

Elliott

Christensen‐Dalsgaard

Kelley

2007

J Comp Physiol A

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“…One is the neuroethological investigation of anuran acoustic communication that grew out of Robert Capranica's seminal work on the neural processing of advertisement calls (for review, see Capranica, 1976;Wilczynski and Capranica, 1984). The other involves evolutionary animal behavior studies using anurans for investigating basic mechanisms of sexual selection, mate choice, and the evolution of communication systems (e.g., Ryan, 1985).…”

Section: Introductionmentioning

confidence: 99%

Current research in amphibians: Studies integrating endocrinology, behavior, and neurobiology

Wilczynski

Lynch

O'Bryant

2005

Hormones and Behavior

107

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Amphibian behavioral endocrinology has focused on reproductive social behavior and communication in frogs and newts. Androgens and estrogens are critical for the expression of male and female behavior, respectively, and their effects are relatively clear. Corticosteroids have significant modulatory effects on the behavior of both sexes, as does the peptide neuromodulator arginine vasotocin in males, but their effects and interactions with gonadal steroids are often complex and difficult to understand. Recent work has shown that the gonadal hormones and social behavior are mutually reinforcing: engaging in social interactions increases hormone levels just as increasing hormone levels change behavior. The reciprocal interactions of hormones and behavior, as well as the complex interactions among gonadal steroids, adrenal steroids, and peptide hormones have implications for the maintenance and evolution of natural social behavior, and suggest that a deeper understanding of both endocrine mechanisms and social behavior would arise from field studies or other approaches that combine behavioral endocrinology with behavioral ecology.

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“…The anuran inner ear is unique among vertebrates in its possession of two dedicated auditory endorgans, the amphibian papilla (AP) and the basilar papilla (BP) (Wever, 1973;Baird, 1974;Capranica, 1976;Lombard and Bolt, 1979;Lewis et al, 1992). Each lies within its own chamber and is sensitive to a distinct band of frequencies.…”

Section: Introductionmentioning

confidence: 99%