Dataset Information

Beyond the limits: identifying the high-frequency detectors in the anuran ear.

ABSTRACT: Despite the predominance of low-frequency hearing in anuran amphibians, a few frog species have evolved high-frequency communication within certain environmental contexts. Huia cavitympanum is the most remarkable anuran with regard to upper frequency limits; it is the first frog species known to emit exclusively ultrasonic signals. Characteristics of the Distortion Product Otoacoustic Emissions from the amphibian papilla and the basilar papilla were analysed to gain insight into the structures responsible for high-frequency/ultrasound sensitivity. Our results confirm the matching of vocalization spectra and inner ear tuning in this species. Compared to most anurans, H. cavitympanum has a hyperextended hearing range spanning from audible to ultrasonic frequencies, far above the previously established 'spectral limits' for the amphibian ear. The exceptional high-frequency sensitivity in the inner ear of H. cavitympanum illustrates the remarkable plasticity of the auditory system and the extent to which evolution can modify a sensory system to adapt it to its environment.

SUBMITTER: Cobo-Cuan A

PROVIDER: S-EPMC7423036 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Beyond the limits: identifying the high-frequency detectors in the anuran ear.

Cobo-Cuan Ariadna A Grafe T Ulmar TU Narins Peter M PM

Biology letters 20200701 7

Despite the predominance of low-frequency hearing in anuran amphibians, a few frog species have evolved high-frequency communication within certain environmental contexts. <i>Huia cavitympanum</i> is the most remarkable anuran with regard to upper frequency limits; it is the first frog species known to emit exclusively ultrasonic signals. Characteristics of the Distortion Product Otoacoustic Emissions from the amphibian papilla and the basilar papilla were analysed to gain insight into the struc ...[more]

PMID: 32603645

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Project description:Objective: The objective of this study was to investigate the role of the high-frequency cochlear dysfunction in the cognitive-ear link. Methods: Seventy-four presbycusis patients (PC group) and seventy-one age-, sex-, and education-level matched normal hearing controls (NH group) were recruited in this study. Participants underwent a battery of cognitive tests estimated by Montreal Cognitive Assessment (MoCA), Stroop Color-Word Interference Test (Stroop), Symbol Digit Modalities Test (SDMT), Auditory Verbal Learning Test (AVLT), and Trail-Making Test (TMT-A and B), as well as auditory tests including distortion product otoacoustic emission (DPOAE), pure tone (PT) thresholds, and speech reception thresholds (SRT). Data were analyzed using the factor analysis, partial correlation analysis, multiple linear regression models, and mediation models. Results: Distortion product otoacoustic emission detection amplitudes and PT thresholds performed worse gradually from low to high frequencies in both the NH and PC groups. High-frequency DPOAE (H-DPOAE) was significantly correlated with cognitive domains in the PC group (AVLT: r = 0.30, p = 0.04; SDMT: r = 0.36, p = 0.01; Stroop: r = -0.32, p = 0.03; TMT-A: r = -0.40, p = 0.005; TMT-B: r = -0.34, p = 0.02). Multiple linear regression models showed that H-DPOAE predicted cognitive impairment effectively for aspects of memory (R 2 = 0.27, 95% CI, 0.03 to 1.55), attention (R 2 = 0.32, 95% CI, -6.18 to -0.40), processing speed (R 2 = 0.37, 95% CI, 0.20 to 1.64), and executive function (TMT-A: R 2 = 0.34, 95% CI, -5.52 to 1.03; TMT-B: R 2 = 0.29, 95% CI, -11.30 to -1.12). H-DPOAE directly affected cognition and fully mediated the relationship between pure tone average (PTA)/SRT and cognitive test scores, excluding MoCA. Conclusion: This study has demonstrated that the high-frequency cochlear amplifier dysfunction has a direct predictive effect on the cognitive decline and makes a large contribution to the cognitive-ear link.

Dataset Information

Beyond the limits: identifying the high-frequency detectors in the anuran ear.

Publications

Beyond the limits: identifying the high-frequency detectors in the anuran ear.

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