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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

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 frequency...
Auditory Perception01:17

Auditory Perception

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 cochlea, a...
Factors Affecting Perception01:25

Factors Affecting Perception

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...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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 identifying...
Hearing01:31

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
Auditory Pathway01:15

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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A principal components model of soundscape perception.

Östen Axelsson1, Mats E Nilsson, Birgitta Berglund

  • 1Gösta Ekman Laboratory, Institute of Environmental Medicine, Karolinska Institutet, and Department of Psychology, Stockholm University, SE-106 91 Stockholm, Sweden.

The Journal of the Acoustical Society of America
|November 30, 2010
PubMed
Summary

A new model identifies three key dimensions of soundscape perception: pleasantness, eventfulness, and familiarity. This framework helps measure and improve urban soundscape quality by linking sound types to listener responses.

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Area of Science:

  • Environmental Psychology
  • Acoustics
  • Psychoacoustics

Background:

  • Understanding soundscape perception is crucial for improving urban environments.
  • Existing models lack a comprehensive framework for measuring soundscape quality.
  • A need exists for a validated model to guide soundscape design and interventions.

Purpose of the Study:

  • To develop and validate a principal components model of soundscape perception.
  • To identify the fundamental dimensions listeners use to evaluate urban soundscapes.
  • To correlate perceptual dimensions with physical soundscape characteristics.

Main Methods:

  • A listening experiment involving 100 participants evaluating 50 urban soundscape excerpts.
  • Utilized 116 attribute scales to capture listener perceptions.
  • Applied principal components analysis (PCA) to identify underlying perceptual dimensions.

Main Results:

  • PCA revealed three dominant dimensions: Pleasantness (50% variance), Eventfulness (18% variance), and Familiarity (6% variance).
  • Technological sounds were associated with unpleasantness; natural sounds with pleasantness; human sounds with eventfulness.
  • These perceptual relationships persisted even after controlling for sound loudness (Zwicker's N(10)), highlighting informational content's role.

Conclusions:

  • The proposed three-component model (Pleasantness, Eventfulness, Familiarity) offers a robust framework for soundscape research and practice.
  • The model guides the selection of essential attributes for measuring soundscape quality.
  • Findings provide actionable insights for promoting high-quality urban soundscapes by managing sound sources.