Auditory evoked potentials from medulla and midbrain in the clawed frog, Xenopus laevis laevis

Бибиков, Н. Г.; Elepfandt, Andreas

doi:10.1016/j.heares.2004.12.009

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…However, the similarity in sound pressure sensitivities is probably due to the Xenopus ear being driven by aerial sound pressure in its cavity, like the ranid ear (Lombard et al 1981). Previous estimates of the Xenopus hearing range in air (0.2-3.5 kHz) and peak sensitivity (between 1.2 and 2 kHz; Hetherington and Lombard 1982;van Dijk et al 2002;Bibikov and Elepfandt 2005;Katbamna et al 2006) are fairly compatible with the total range and peak sensitivity of our CF measurements.…”

Section: Underwater Audiogram Estimation and Comparison To Earlier Mesupporting

confidence: 89%

“…All cells can follow overlapping 63-Hz clicks in the fast trill of the male advertisement call, as predicted by reports of brainstem auditory evoked potentials (Bibikov and Elepfandt 2005). In contrast, some DMN neurons in terrestrial frogs exhibit band-pass characteristics, selecting with mean spike count for AM rates between 10 and 40 Hz Feng and Lin 1994).…”

Section: Encoding Of Natural Vocalizationsmentioning

confidence: 65%

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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: Underwater Audiogram Estimation and Comparison To Earlier Mesupporting

confidence: 89%

Section: Encoding Of Natural Vocalizationsmentioning

confidence: 65%

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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“…However, we still lack a well-developed understanding of both species differences in anuran hearing and the influences such differences potentially have on the species specificity of vocalizations and behaviors in a broad, comparative framework. One reason for this is because the vast majority of anatomical, biomechanical, and electrophysiological studies of anuran hearing have been conducted using a relatively small number of model species, such as northern leopard frogs, Rana pipiens (e.g., Fuzessery and Feng 1981, 1982; Simmons et al 1992; Ratnam and Feng 1998; Ho and Narins 2006), North American bullfrogs, R. catesbeiana (e.g., Feng and Capranica 1976; Schwartz and Simmons 1990; Simmons and Ferragamo 1993; Simmons et al 1993, 2000), grass frogs, R. temporaria (e.g., Christensen-Dalsgaard and Jørgensen 1996; Christensen-Dalsgaard et al 1998; Christensen-Dalsgaard and Walkowiak 1999; Bibikov 2002), African clawed frogs, Xenopus laevis (e.g., Christensen-Dalsgaard et al 1990; Edwards and Kelley 2001; Bibikov and Elepfandt 2005; Elliott et al 2007, 2011), and green treefrogs, Hyla cinerea (e.g., Feng and Capranica 1978; Ehret and Capranica 1980; Mudry and Capranica 1987; Klump et al 2004; Miranda and Wilczynski 2009a, b). Efforts to assess audition in frogs and toads using relatively fast, minimally invasive procedures, such as dermal or subdermal recordings of auditory evoked potentials (AEPs) (reviewed in Hall 2007), could significantly enhance experimental neuroethological research on this group by facilitating comparisons among a much greater diversity of species.…”

Section: Introductionmentioning

confidence: 99%

“…While a few previous studies used AEPs to investigate the auditory systems of frogs, these studies used invasive recording procedures requiring surgery (Corwin et al 1982; Hillery 1984a; Seaman 1991; Carey and Zelick 1993; Bibikov and Elepfandt 2005; Katbamna et al 2006b; Yu et al 2006). To our knowledge, only two previous studies have recorded AEPs in frogs using less invasive subdermal procedures (Katbamna et al 2006a; Zhang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Auditory brainstem responses in Cope’s gray treefrog (Hyla chrysoscelis): effects of frequency, level, sex and size

et al. 2014

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Our knowledge of the hearing abilities of frogs and toads is largely defined by work with a few well-studied species. One way to further advance comparative work on anuran hearing would be greater use of minimally invasive electrophysiological measures, such as the auditory brainstem response (ABR). This study used the ABR evoked by tones and clicks to investigate hearing in Cope's gray treefrog (Hyla chrysoscelis). The objectives were to characterize the effects of sound frequency, sound pressure level, and subject sex and body size on ABRs. The ABR in gray treefrogs bore striking resemblance to ABRs measured in other animals. As stimulus level increased, ABR amplitude increased and latency decreased, and for responses to tones, these effects depended on stimulus frequency. Frequency-dependent differences in ABRs were correlated with expected differences in the tuning of two sensory end organs in the anuran inner ear (the amphibian and basilar papillae). The ABR audiogram indicated two frequency regions of increased sensitivity corresponding to the expected tuning of the two papillae. Overall, there was no effect of subject size and only small effects related to subject sex. Together, these results indicate the ABR is an effective method to study audition in anurans.

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“…Though a handful of previous studies have measured brainstem potentials in anurans using methods that require surgery (Bibikov and Elepfandt, 2005; Carey and Zelick, 1993; Corwin et al, 1982; Hillery, 1984; Katbamna et al, 2006b; Seaman, 1991; Yu et al, 2006), recordings of ABRs in anurans using subcutaneous electrodes have been limited to just three previous studies (Katbamna et al, 2006a; Schrode et al, in press; Zhang et al, 2012). …”

Section: Introductionmentioning

confidence: 99%

Assessing stimulus and subject influences on auditory evoked potentials and their relation to peripheral physiology in green treefrogs (Hyla cinerea)

Buerkle

Schrode

Bee

2014

Comparative Biochemistry and Physiology Part A: Molecular &

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Anurans (frogs and toads) are important models for comparative studies of communication, auditory physiology, and neuroethology, but to date, most of our knowledge comes from in-depth studies of a relatively small number of model species. Using the well-studied green treefrog (Hyla cinerea), this study sought to develop and evaluate the use of auditory evoked potentials (AEPs) as a minimally invasive tool for investigating auditory sensitivity in a larger diversity of anuran species. The goals of the study were to assess the effects of frequency, signal level, sex, and body size on auditory brainstem response (ABR) amplitudes and latencies, characterize gross ABR morphology, and generate an audiogram that could be compared to several previously published audiograms for green treefrogs. Increasing signal level resulted in larger ABR amplitudes and shorter latencies, and these effects were frequency dependent. There was little evidence for an effect of sex or size on ABRs. Analyses consistently distinguished between responses to stimuli in the frequency ranges of the three previously-described populations of afferents that innervate the two auditory end organs in anurans. The overall shape of the audiogram shared prominent features with previously published audiograms. This study highlights the utility of AEPs as a valuable tool for the study of anuran auditory sensitivity.

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Auditory evoked potentials from medulla and midbrain in the clawed frog, Xenopus laevis laevis

Cited by 6 publications

References 29 publications

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

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

Auditory brainstem responses in Cope’s gray treefrog (Hyla chrysoscelis): effects of frequency, level, sex and size

Assessing stimulus and subject influences on auditory evoked potentials and their relation to peripheral physiology in green treefrogs (Hyla cinerea)

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