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Acoustic cues underlying auditory distance in barn owls.
Duck O Kim1, Andrew Moiseff, J Bradley Turner
1Department of Neuroscience, University of Connecticut Health Center, Farmington, CT, USA. KIM@neuron.uchc.edu
The direct-to-reverberant (D/R) ratio in one ear is the best indicator of sound-source distance for owls. Auditory localization theories must account for how acoustic cues change with distance.
Area of Science:
- Auditory Neuroscience
- Bioacoustics
- Animal Behavior
Background:
- Understanding neural mechanisms of auditory distance localization is limited.
- This study investigates acoustic cues used by barn owls for distance perception.
Purpose of the Study:
- To identify the primary acoustic cues for sound-source distance localization in barn owls.
- To evaluate the contribution of different binaural and monaural cues to distance perception.
Main Methods:
- Measured binaural room impulse responses in adult barn owls.
- Varied sound source distance (up to 80 cm) and azimuth (0-90 degrees) at 0 degrees elevation.
Main Results:
- The direct-to-reverberant (D/R) ratio in the ipsilateral ear was the most informative cue for distance.
- Interaural level difference (ILD) and interaural time difference (ITD) provided less distance information.
- Spectral patterns of ILD and monaural signals changed complexly with distance.
Conclusions:
- Ipsilateral monaural D/R ratio is a key cue for sound-source distance.
- Interaural level difference (ILD) offers less distance information.
- A complete theory of 3D auditory localization must include distance-dependent changes in acoustic cues.
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