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Related Concept Videos

Echo01:06

Echo

639
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Related Experiment Video

Updated: Oct 3, 2025

Evaluation of Auditory Brainstem Response in Chicken Hatchlings
09:32

Evaluation of Auditory Brainstem Response in Chicken Hatchlings

Published on: April 1, 2022

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Chickens have excellent sound localization ability.

Bianca Krumm1,2, Georg M Klump1, Christine Köppl2

  • 1Cluster of Excellence "Hearing4all 2.0", Division for Animal Physiology and Behaviour, School of Medicine and Health Sciences, Department of Neuroscience, Carl von Ossietzky University of Oldenburg, 26129 Oldenburg, Germany.

The Journal of Experimental Biology
|February 14, 2022
PubMed
Summary
This summary is machine-generated.

This study on chickens reveals how they localize sounds using auditory cues. Chickens likely use interaural time differences at lower frequencies and interaural level differences at higher frequencies for sound localization.

Keywords:
Behavioural acuityBirdInteraural level differenceInteraural time differencePerceived physical cues

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Area of Science:

  • Auditory Neuroscience
  • Animal Behavior
  • Bioacoustics

Background:

  • The precise mechanisms of sound localization in animals are not fully understood.
  • Identifying the dominant auditory cues used for sound localization is a key research question.

Purpose of the Study:

  • To investigate sound localization acuity in chickens (Gallus gallus).
  • To correlate behavioral data with physical auditory cues, specifically interaural time differences (ITDs) and interaural level differences (ILDs).

Main Methods:

  • Behavioral experiments quantified sound localization acuity using the minimum audible angle (MAA) for pure tones and broadband noise.
  • Head-related transfer functions (HRTFs) were used to estimate external auditory cues.
  • Internal auditory cues were derived by incorporating data on the chicken's middle ear system.

Main Results:

  • Chickens demonstrated excellent sound localization acuity, with broadband-noise MAA at 12.2 degrees.
  • Pure-tone MAA varied with frequency, ranging from 8.9 to 14.5 degrees.
  • Estimates suggest chickens primarily use ITDs at low frequencies (500-1000 Hz) and ILDs at high frequencies (2000-4000 Hz).

Conclusions:

  • Chickens exhibit high sound localization performance.
  • The study provides evidence for a frequency-dependent shift in the dominant auditory cues used for sound localization in chickens.
  • Findings contribute to understanding the evolution and mechanisms of auditory spatial processing in vertebrates.