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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

5.8K
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...
5.8K
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

1.2K
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...
1.2K
Auditory Perception01:17

Auditory Perception

1.3K
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...
1.3K
Auditory Pathway01:15

Auditory Pathway

7.7K
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...
7.7K
Sound as Pressure Waves01:17

Sound as Pressure Waves

4.7K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
4.7K
Hearing01:31

Hearing

57.9K
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.
57.9K

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Related Experiment Video

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Cross-Modal Multivariate Pattern Analysis
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Mapping urban soundscape patterns using user-generated content: A place model approach to acoustic environment

Haneul Lee1, Youngchul Kim1

  • 1KAIST Urban Design Lab, KAIST Smart City Research Center, Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.

Plos One
|February 24, 2026
PubMed
Summary

This study used social media data to analyze urban soundscapes in Seoul. Activity-related sounds dominate, with distinct acoustic zones identified by urban function and historical context.

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Area of Science:

  • Urban planning and acoustic ecology
  • Human-computer interaction and social media analytics
  • Environmental psychology and spatial cognition

Background:

  • Urban acoustic environments impact quality of life, shifting focus from noise reduction to holistic soundscape design.
  • Understanding human perception of urban soundscapes is crucial for effective urban planning and design.
  • Social media data offers a novel approach to capture and analyze public perception of urban acoustic environments.

Purpose of the Study:

  • To investigate urban soundscape perceptions by analyzing social media data.
  • To understand how acoustic environments reflect specific urban spatial characteristics.
  • To develop a scalable tool for urban planners to assess citizen experiences of urban soundscapes.

Main Methods:

  • Collected Korean-language Twitter data from 156 points of interest in Seoul (Oct-Nov 2020).
  • Preprocessed text data (cleaning, morphological analysis) and classified soundscapes using a taxonomy based on Canter's place model (physical setting, activity, meaning).
  • Applied K-means clustering to identify distinct urban soundscape types based on spatial and functional characteristics.

Main Results:

  • Activity-related soundscapes constituted the majority (79.4%) across all analyzed areas.
  • Negative correlations between indoor, mechanical, and behavioral soundscapes indicated functional spatial separation of acoustic zones.
  • Historical districts exhibited a higher proportion of meaning-related soundscapes (22.0%) compared to modern commercial districts (13.4%).
  • Identified three distinct soundscape clusters: infrastructure-dominated, socially vibrant, and commercial indoor-focused zones.

Conclusions:

  • Social media analysis combined with spatial patterns provides data-driven insights for contextualized urban design.
  • The study offers a scalable method for urban planners to understand citizen experiences of urban soundscapes.
  • Findings highlight the importance of considering perceptual dimensions in urban soundscape design for improved quality of life.