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Related Concept Videos

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...
Sound Intensity00:58

Sound Intensity

The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the emitted...
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...
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...
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.
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
Unlike the time average of a sinusoidal term, which is zero since it is positive and...

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Related Experiment Video

Updated: Jun 6, 2026

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
14:05

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

Published on: January 23, 2017

Stimulus statistical context sensitivity of deviant responses to auditory intensity changes.

Maryam Aghamolaei1, Abishek Umashankar1, Ekaterina Yukhnovich1

  • 1Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK.

Scientific Reports
|June 4, 2026
PubMed
Summary
This summary is machine-generated.

Mismatch negativity (MMN) to sound intensity changes is enhanced in a low-variability context. High-intensity MMN modulation is robust, while low-intensity MMN modulation is context-dependent, suggesting adaptation influences its processing.

Keywords:
DeviantEvoked potentialsIntensityLoudnessMismatch negativityPrediction errorPredictive processing

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Related Experiment Videos

Last Updated: Jun 6, 2026

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Area of Science:

  • Auditory Neuroscience
  • Cognitive Neuroscience
  • Human EEG Research

Background:

  • Mismatch negativity (MMN) reveals sensory processing and its clinical alterations.
  • MMN is influenced by statistical stimulus context, like standard deviation (SD) of tone frequencies.
  • The impact of statistical context on intensity changes, unlike other sensory features, remains understudied.

Purpose of the Study:

  • To investigate if statistical context modulates MMN evoked by stimulus intensity changes.
  • To compare the statistical modulation of high-intensity versus low-intensity deviants.
  • To explore potential differences in MMN processing based on intensity and experimental paradigm.

Main Methods:

  • Two electroencephalography (EEG) experiments were conducted on normal-hearing volunteers (n=17/15).
  • Participants were exposed to auditory stimuli with varying intensity deviants within different standard deviation contexts.
  • MMN responses were recorded and analyzed to assess the effects of stimulus context and intensity.

Main Results:

  • MMN to intensity deviants was larger in a low-SD context, consistent with other stimulus properties.
  • High-intensity MMN modulation was observed earlier and consistently across both experiments.
  • Low-intensity MMN modulation showed delayed onset and was paradigm-dependent, suggesting adaptation's role.

Conclusions:

  • Statistical context significantly modulates MMN evoked by intensity changes.
  • High-intensity MMN processing appears more robust to statistical variations than low-intensity MMN.
  • Adaptation over longer timescales or higher cortical levels may be necessary for statistical modulation of low-intensity MMN.