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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Echo01:06

Echo

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Related Experiment Video

Updated: Jul 2, 2026

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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Published on: January 23, 2017

The barn owls' Minimum Audible Angle.

Bianca Krumm1,2, Georg M Klump1, Christine Köppl2

  • 1Cluster of Excellence "Hearing4all", Division for Animal Physiology and Behaviour, School of Medicine and Health Sciences, Department of Neuroscience, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany.

Plos One
|August 24, 2019
PubMed
Summary
This summary is machine-generated.

Barn owls show improved sound localization at higher frequencies and for frontal sound sources. Their minimum audible angle (MAA) decreases with increasing frequency and is smallest for broadband noise.

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Area of Science:

  • Auditory neuroscience
  • Animal behavior
  • Bioacoustics

Background:

  • Interaural time differences (ITD) and interaural level differences (ILD) are key cues for sound localization.
  • Barn owls possess exceptional hearing, crucial for communication and survival.
  • Previous studies often used reflexive responses and higher frequencies.

Purpose of the Study:

  • To measure barn owl sound localization acuity (MAA) across different frequencies and sound source positions.
  • To investigate the influence of stimulus type (narrow-band and broad-band noise) on MAA.
  • To correlate behavioral findings with physical and neural characteristics of sound localization.

Main Methods:

  • Utilized a Go/NoGo paradigm to assess behavioral sound localization acuity.
  • Tested narrow-band noise at 500, 1000, 2000, 4000, and 8000 Hz, plus broad-band noise.
  • Varied sound source positions to evaluate spatial effects on MAA.

Main Results:

  • MAA improved significantly with increasing stimulus frequency (14° at 500 Hz to 6° at 8000 Hz).
  • Broadband noise yielded the smallest MAA (4°).
  • Frontal sound sources resulted in smaller MAAs than lateral sources, regardless of stimulus type.

Conclusions:

  • Sound localization acuity in barn owls is frequency-dependent, improving at higher frequencies.
  • Spatial acuity is better for frontal sounds due to physical and neural ITD variations.
  • The study provides insights into the combined influence of physical cues and neural processing on auditory spatial perception.