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Related Concept Videos

Echo01:06

Echo

1.2K
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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Related Experiment Video

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Evaluation of Auditory Brainstem Response in Chicken Hatchlings
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Sound avoidance by hens.

J G MacKenzie1, T M Foster, W Temple

  • 1Department of Psychology, University of Waikato, Hamilton, New Zealand.

Behavioural Processes
|June 5, 2014
PubMed
Summary
This summary is machine-generated.

Hens avoided high-intensity sounds (105-110 dB(A)) and some taped noises (90 dB(A)) by turning them off. This method reliably identified aversive sounds in individual chickens.

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Area of Science:

  • Animal Behavior
  • Acoustic Perception
  • Ethology

Background:

  • Understanding animal responses to auditory stimuli is crucial for welfare.
  • Quantifying sound aversiveness in poultry requires reliable behavioral assays.

Purpose of the Study:

  • To assess the aversiveness of various sounds to hens.
  • To validate a behavioral method for measuring sound aversion in individual chickens.

Main Methods:

  • Six hens were trained to operate a mechanism to deactivate sounds.
  • A variety of sounds (pure tones, taped animal/machine noises) at different intensities were presented.
  • Hens' avoidance behavior (time spent with sound off) was recorded.

Main Results:

  • Hens actively turned off high-intensity pure tones (105-110 dB(A)).
  • Certain taped sounds (animal and machine-generated) at 90 dB(A) were also avoided.
  • The method demonstrated reliable individual avoidance and differential responding to sound intensity.

Conclusions:

  • The behavioral assay is effective in identifying aversive sounds for individual hens.
  • High sound intensity and specific complex sounds are perceived as aversive by hens.
  • Further research is needed to understand the nuances of sound aversion and non-aversiveness.