Anatomy, Physiology, and Function of Auditory End-Organs in the Frog Inner Ear

Simmons, Dwayne D.; Meenderink, Sebastiaan W. F.; Vassilakis, Pantelis N.

doi:10.1007/978-0-387-47796-1_7

Cited by 23 publications

(32 citation statements)

References 139 publications

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“…The understanding of temporal processing in early stages of the anuran auditory system is still relatively limited compared with knowledge of frequency selectivity at these stages (Lewis and Narins, 1999;Simmons et al, 2007). Nonetheless, previous studies (e.g.…”

Section: Temporal and Frequency Filters In The Nervous Systemmentioning

confidence: 99%

“…Specifically, amphibians have two anatomically and physiologically distinct inner-ear organs specialized for detecting airborne sound, the amphibian papilla (AP) and the basilar papilla (BP) (Lewis and Narins, 1999;Simmons et al, 2007). These organs respond best to sounds of different frequencies: the AP to low-frequency sounds and the BP to higher frequency sounds.…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, there is reason to expect differences between the two frequency channels of the auditory periphery in the processing of the pattern of amplitude modulation (AM) because of general trade-offs in auditory systems between frequency and time resolution (Gabor, 1946). Thus, fibers innervating the AP, which tend to be more narrowly tuned to specific frequencies, may have weaker resolution of AM rates than fibers innervating the BP, which tend to be more broadly tuned (Feng et al, 1991;Ronken, 1991;Simmons et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Frequency-channel dependent selectivity for temporal call characteristics in gray treefrogs, Hyla versicolor

Reichert

Höbel

2017

Journal of Experimental Biology

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Sensory receptors transmit information on multiple stimulus dimensions. Much remains to be understood about how the processing of different signal characteristics is partitioned and integrated in different areas of the nervous system. Amphibian hearing involves two morphologically distinct inner-ear organs that process different components of the frequency spectrum. Many anuran signals contain two frequency peaks, each one matching the sensitivity of one of these two organs. We hypothesized that the processing of temporal characteristics of acoustic signals would differ in these two frequency channels, perhaps because of differences in the response properties of the two inner-ear organs. We tested this hypothesis in the gray treefrog, Hyla versicolor; male advertisement calls of this species contain a bimodal frequency spectrum. We generated synthetic male advertisement calls in which we independently manipulated the pattern of amplitude modulation in the low-frequency peak or the high-frequency peak and measured the attractiveness of these stimuli to females in single-speaker and twospeaker phonotaxis tests. We obtained multiple lines of evidence that females were more selective for fine-temporal characteristics in the high-frequency peak. We discuss the potential implications of frequency channel-dependent temporal processing for signal evolution and suggest that additional neurophysiological investigations of the anuran auditory periphery will give important insights into how the nervous system partitions the encoding of multiple characteristics of complex signals.

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Section: Temporal and Frequency Filters In The Nervous Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency-channel dependent selectivity for temporal call characteristics in gray treefrogs, Hyla versicolor

Reichert

Höbel

2017

Journal of Experimental Biology

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“…Within the bullfrog inner ear, the amphibian papilla (AP) is a sensor of airborne, low-frequency sound. The AP contains mechanosensitive hair cells that, like the mammalian cochlea, are contacted by the terminal arbors of both afferent and efferent neurons, are tonotopically organized, and generate otoacoustic emissions (OAEs) when tones are given to the ear (reviewed in Simmons et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…DPOAEs are a sensitive indicator of inner ear integrity and are used routinely for diagnostic screening of inner ear function (Brown et al, 2000;Lonsbury-Martin et al, 1993;Ohlms et al, 1991;Prieve, 2002;Shera and Guinan, 1999). Although DPOAEs initially were thought to be absent in the amphibian ear (Baker et al, 1989), they are now believed to be present in most anuran amphibians (van Dijk and Manley, 2001;Simmons et al, 2007). Some studies suggest that anurans may have both passive and active mechanisms responsible for the generation of DPOAEs (Meenderink and van Dijk, 2006;van Dijk et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Recovery of otoacoustic emissions after high-level noise exposure in the American bullfrog

Simmons

Lohr

Wotring

et al. 2014

Journal of Experimental Biology

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There was an error published in J. Exp. Biol. 217, pp. 1626-1636 In Fig. 3, panel A has a duplicated line graph and the keys in panels B and D are incorrect. The correct figure is printed below. The cubic distortion product (DP) 2f 1 -f 2 recorded from the bullfrog ear with primary f 1 and secondary f 2 frequencies as shown. In this example, secondary levels are 10 dB lower than primary levels. (B) Plot of cubic distortion product otoacoustic emission (DPOAE) levels from the right ear (ipsilateral) versus secondary frequency (f 2 ). DPOAE levels are in decibels relative to 1 V rms (dBV). The plot depicts DPOAE levels recorded before (solid symbols) and 24 h after (open symbols) 150 dB SPL broad-band noise exposure. Filled and open squares represent corresponding pre-and post-noise levels, respectively. At each frequency, the primary stimulus was held constant at 80 dB SPL and the secondary stimulus level was presented at equal strength (solid squares, L 1 =L 2 ) and then with secondary levels 10 dB lower than primary levels (solid circles, L 1 >L 2 ). Noise level measurements were taken and averaged on either side of the peak DPOAE level immediately before and after noise exposure, with each ear tested and averaged over three presentations. Dashed lines represent noise floor. (C) Cubic DPOAEs (L 1 >L 2 ) from the right ear were tested before (day 0) and 1, 2, 5, 6, 7 and 8 days after noise exposure. Dashed lines represent noise floor. (D) Plot of the DPOAE shifts at each frequency tested before (0 days) and following (1, 2, 5, 6, 7 and 8 days) a 20 h noise exposure. The DPOAE shift was calculated as the difference in pre-exposure and post-exposure DPOAE levels.We apologise to the authors and readers for this omission. DP level (dBV) day 0 DP level (dBV) day 1 DP level (dBV) day 2 DP level (dBV) day 5 DP level (dBV) day 6 DP level (dBV) day 7 DP level (dBV) day 8Pre-exposure, L1>L2 Pre-exposure, L1=L2 Post-exposure, L1>L2 Post-exposure, L1=L2 DP level (dBV) day 0 DP level (dBV) day 1 DP level (dBV) day 2 DP level (dBV) day 5 DP level (dBV) day 7 DP level (dBV) day 8 BThe ABSTRACTThe American bullfrog (Rana catesbeiana) has an amphibian papilla (AP) that senses airborne, low-frequency sound and generates distortion product otoacoustic emissions (DPOAEs) similar to other vertebrate species. Although ranid frogs are typically found in noisy environments, the effects of noise on the AP have not been studied. First, we determined the noise levels that diminished DPOAE at 2f 1 -f 2 using an f 2 stimulus level at 80 dB SPL and that also produced morphological damage of the sensory epithelium. Second, we compared DPOAE (2f 1 -f 2 ) responses with histopathologic changes occurring in bullfrogs after noise exposure. Consistent morphological damage, such as fragmented hair cells and missing bundles, as well as elimination of DPOAE responses were seen only after very highlevel (>150 dB SPL) sound exposures. The morphological response of hair cells to noise differed along the mediolateral AP axis: medial hair cells were sens...

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Mechanics of the exceptional anuran ear

2008

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The anuran ear is frequently used for studying fundamental properties of vertebrate auditory systems. This is due to its unique anatomical features, most prominently the lack of a basilar membrane and the presence of two dedicated acoustic end organs, the basilar papilla and the amphibian papilla. Our current anatomical and functional knowledge implies that three distinct regions can be identified within these two organs. The basilar papilla functions as a single auditory filter. The low-frequency portion of the amphibian papilla is an electrically tuned, tonotopically organized auditory end organ. The high-frequency portion of the amphibian papilla is mechanically tuned and tonotopically organized, and it emits spontaneous otoacoustic emissions. This high-frequency portion of the amphibian papilla shows a remarkable, functional resemblance to the mammalian cochlea.

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Anatomy, Physiology, and Function of Auditory End-Organs in the Frog Inner Ear

Cited by 23 publications

References 139 publications

Frequency-channel dependent selectivity for temporal call characteristics in gray treefrogs, Hyla versicolor

Frequency-channel dependent selectivity for temporal call characteristics in gray treefrogs, Hyla versicolor

Recovery of otoacoustic emissions after high-level noise exposure in the American bullfrog

Mechanics of the exceptional anuran ear

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