The Open UniversitySkip to content
 

Absolute hearing thresholds and critical masking ratios in the European barn owl: a comparison with other owls

Dyson, M. L.; Klump, G. M. and Gauger, B. (1998). Absolute hearing thresholds and critical masking ratios in the European barn owl: a comparison with other owls. Journal of Comparative Physiology A, 182(5) pp. 695–702.

DOI (Digital Object Identifier) Link: https://doi.org/10.1007/s003590050214
Google Scholar: Look up in Google Scholar

Abstract

Absolute thresholds and critical masking ratios were determined behaviorally for the European barn owl (Tyto alba guttata). It shows an excellent sensitivity throughout its hearing range with a minimum threshold of −14.2 dB sound pressure level at 6.3 kHz, which is similar to the sensitivity found in the American barn owl (Tyto alba pratincola) and some other owls. Both the European and the American barn owl have a high upper-frequency limit of hearing exceeding that in other bird species. Critical masking ratios, that can provide an estimate for the frequency selectivity in the barn owl's hearing system, were determined with a noise of about 0 dB spectrum level. They increased from 19.1 dB at 2 kHz to 29.2 dB at 8 kHz at a rate of 5.1 dB per octave. The corresponding critical ratio bandwidths were 81, 218, 562 and 831 Hz for test-tone frequencies of 2, 4, 6.3 and 8 kHz, respectively. These values indicate, contrary to expectations based on the spatial representation of frequencies on the basilar papilla, increasing bandwidths of auditory filters in the region of the barn owl's auditory fovea. This increase, however, correlates with the increase in the bandwidths of tuning curves in the barn owl's auditory fovea.

Item Type: Journal Item
Copyright Holders: 1998 Springer-Verlag
ISSN: 1432-1351
Project Funding Details:
Funded Project NameProject IDFunding Body
GrantNot SetDeutsche Forschungsgemeinschaft
StipendNot SetAlexander von Humboldt Stiftung
Keywords: barn owl; bird; absolute threshold; critical masking ratio; Basilar papilla
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 44577
Depositing User: Miranda Dyson
Date Deposited: 08 Oct 2015 13:17
Last Modified: 07 May 2019 07:56
URI: http://oro.open.ac.uk/id/eprint/44577
Share this page:

Metrics

Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU