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Related Concept Videos

Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
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Factors Affecting Perception01:25

Factors Affecting Perception

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...
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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Sound Intensity Level00:53

Sound Intensity Level

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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.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
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Echo01:06

Echo

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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

Updated: Jan 2, 2026

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Complex Acoustic Environments: Review, Framework, and Subjective Model.

Adam Weisser1,2, Jörg M Buchholz1,2, Gitte Keidser2,3

  • 1Department of Linguistics, Faculty of Human Sciences, Macquarie University, Sydney, Australia.

Trends in Hearing
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a framework for understanding complex acoustic environments, identifying key characteristics like multiple sources and listener tasks that influence perceived complexity. Results show "comfort" and "variability" define complexity, with speech altering perception.

Keywords:
complex acoustic environmentscomplexityhearingperceptionthree-way principal component analysis

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Environmental Psychology

Background:

  • The concept of complex acoustic environments lacks a unified definition across research fields.
  • Existing literature shows varied interpretations of acoustic scene complexity.

Purpose of the Study:

  • To develop a framework characterizing complex acoustic environments.
  • To identify key acoustic scene characteristics influencing perceived complexity.
  • To investigate the impact of these characteristics on listeners' perception of complexity.

Main Methods:

  • Literature review to develop a framework of nine complexity-driving characteristics.
  • Experimental study using realistic acoustic scenes with varying characteristics (multiple sources, diversity, reverberation, listener task).
  • Data analysis via three-way principal component analysis (Tucker3 model) on listener ratings.

Main Results:

  • Perceived complexity is primarily defined by "comfort" and "variability" dimensions.
  • The listener's task, specifically attending to target speech, influences complexity ratings towards comfort.
  • Background speech creates individual differences in distraction, suggesting varying listener susceptibility.

Conclusions:

  • The proposed framework effectively organizes characteristics of complex acoustic environments.
  • Listener factors and task demands significantly modulate the perception of acoustic scene complexity.
  • Individual differences in response to background speech highlight the subjective nature of acoustic environments.