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Determining Hearing Thresholds in Dogs Using the Staircase Method.
Cécile Guérineau1, Anna Broseghini1, Miina Lõoke1
1Dipartimento di Biomedicina Comparata e Alimentazione, University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
Veterinary Sciences
|February 23, 2024
Summary
This study measured dog hearing sensitivity using a behavioral approach. Dogs demonstrated acute hearing, particularly at higher frequencies, suggesting a role in canine communication.
Area of Science:
- Animal Behavior
- Auditory Science
- Veterinary Medicine
Background:
- Growing interest in canine auditory perception and behavioral responses to sound.
- Limited research on basic hearing sensitivity (minimal intensity thresholds) in dogs.
- Previous audiograms often used less accurate electrophysiological methods.
Purpose of the Study:
- To determine hearing thresholds across different frequencies in dogs using a behavioral assessment.
- To enhance the reliability of hearing threshold measurements through an adaptive procedure.
- To investigate potential explanations for high-frequency hearing sensitivity in dogs.
Main Methods:
- Utilized a staircase method for adaptive intensity assessment of hearing thresholds.
- Tested hearing sensitivity in five dogs at three specific frequencies: 0.5 kHz, 4.0 kHz, and 20.0 kHz.
- Ensured reliability by obtaining multiple assessments around each animal's hearing threshold.
Main Results:
- Established hearing thresholds: 19.5 ± 2.8 dB SPL (0.5 kHz), 14.0 ± 4.5 dB SPL (4.0 kHz), and 8.5 ± 12.8 dB SPL (20.0 kHz).
- Results at 0.5 kHz and 4.0 kHz align with existing literature.
- A significantly lower threshold at 20.0 kHz was observed, indicating heightened sensitivity in this range.
Conclusions:
- The behavioral staircase method provides reliable hearing threshold data in dogs.
- Dogs exhibit remarkable hearing sensitivity at 20 kHz, exceeding previous expectations.
- This high-frequency sensitivity may be linked to intraspecific communication and vocalizations in canids.
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