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Related Concept Videos

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 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...
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...
Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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...
Physical Assessment of the Respiratory Tract IV: Auscultation01:28

Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
Breath Sounds
Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.

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Related Experiment Video

Updated: Jun 22, 2026

Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R
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Published on: December 9, 2022

[Extra-auditory effects of noise].

G Tomei1, M F Anzani, T Casale

  • 1Dipartimento di Scienze Psichiatriche e Medicina Psicologica, Sapienza Università di Roma, Italy.

Giornale Italiano Di Medicina Del Lavoro Ed Ergonomia
|June 30, 2009
PubMed
Summary
This summary is machine-generated.

Noise exposure can cause non-auditory health issues, affecting various organs and potentially impacting psychophysical well-being. Factors like noise intensity, duration, and individual susceptibility influence these extra-auditory effects.

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Area of Science:

  • Environmental Health
  • Occupational Medicine
  • Toxicology

Context:

  • Decades of research link noise exposure to non-auditory health problems.
  • Noise-induced modifications can range from normal biological variations to significant psychophysical impairment.
  • Reversibility and adaptation depend on organism resilience and environmental factors.

Purpose:

  • To review the multifaceted effects of noise exposure beyond auditory damage.
  • To identify factors influencing noise-induced health alterations.
  • To explore the neuro-immune-endocrine pathways involved in extra-auditory effects.

Summary:

  • Noise exposure correlates with pathologies in multiple organ systems, not just the auditory system.
  • Biochemical, physiological, and psychosocial modifications result from noise, influenced by exposure characteristics, genetics, and acquired factors.
  • Extra-auditory effects are hypothesized to involve the autonomic nervous system, impacting neuro-immune-endocrine parameters.

Impact:

  • Highlights the systemic impact of noise pollution on human health.
  • Underscores the importance of considering noise as a significant environmental health risk.
  • Informs public health policies and occupational safety guidelines regarding noise exposure limits and mitigation strategies.