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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.
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...
Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Sound Intensity Level00:53

Sound Intensity Level

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 hence a...
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...
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...

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Related Experiment Video

Updated: Jun 5, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
07:13

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage

Published on: February 10, 2023

Hearing loss after noise exposure.

Revadi Govindaraju1, Rahmat Omar, Raman Rajagopalan

  • 1Department of Otorhinolaryngology, University of Malaya, Kuala Lumpur, Malaysia. grevadi@gmail.com

Auris, Nasus, Larynx
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Higher field strength 3 Tesla (T) MRI noise may harm hearing. A patient experienced temporary hearing loss and persistent tinnitus after a 3T MRI, suggesting potential auditory risks.

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Area of Science:

  • Audiology
  • Medical Imaging
  • Neuroscience

Background:

  • Higher field strength magnetic resonance imaging (MRI), particularly 3 Tesla (T) and above, generates significant acoustic noise.
  • Previous studies have documented temporary threshold shifts in hearing following lower field strength MRI examinations.
  • The auditory effects of noise from 3T MRI have not been extensively reported.

Observation:

  • A patient undergoing a 3T MRI for chronic backache reported hearing loss and tinnitus immediately post-examination.
  • Diagnostic audiological assessments, including pure tone audiogram, distortion product otoacoustic emissions (DPOAE), and brainstem electrical response audiometry (BERA), were performed.
  • The assessments revealed a unilateral sensorineural hearing loss.

Findings:

  • The patient's hearing loss resolved within three days, consistent with a temporary threshold shift.
  • Tinnitus, however, persisted despite the recovery of hearing function.
  • The findings suggest that 3T MRI noise may pose a risk to the auditory system, potentially causing temporary threshold shifts or, less likely, sudden sensorineural hearing loss.

Implications:

  • This case highlights the potential ototoxic effects of acoustic noise generated by high-field MRI systems.
  • Further research is warranted to understand the mechanisms and prevalence of hearing-related issues following 3T MRI.
  • Audiological monitoring and protective measures may be considered for patients undergoing high-field MRI examinations.