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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...
Sound as Pressure Waves01:17

Sound as Pressure Waves

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...
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...
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...

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Related Experiment Video

Updated: May 15, 2026

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals
11:15

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals

Published on: May 23, 2017

Brain Representations of Natural Sound Statistics.

Yousef Mohammadi1,2, Alexander J Billig3, Joel I Berger4

  • 1Department of Imaging Neuroscience, University College London, London WC1N 3AR, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

The human brain processes natural sound statistics in the auditory cortex, with the hippocampus modulating responses when sounds are less natural or ambiguous. This reveals how we perceive complex acoustic environments.

Keywords:
auditory cortexentorhinal cortexfMRIhippocampusnatural sound texturessummary statistics

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Acoustics

Background:

  • Natural sound textures are defined by statistical properties.
  • Neural processing of these statistics is not well understood.
  • Auditory cortex and medial temporal lobe (MTL) are implicated in pattern analysis.

Purpose of the Study:

  • Investigate neural correlates of sound texture statistics.
  • Examine brain responses to synthetic sound textures with varied statistical structure.
  • Determine the role of auditory cortex and MTL in processing acoustic statistics.

Main Methods:

  • Used functional magnetic resonance imaging (fMRI) in two experiments.
  • Manipulated low-level and high-level statistical properties of synthetic sound textures.
  • Examined neural responses along the auditory pathway, auditory cortex, and MTL.

Main Results:

  • Increasing sound texture naturalness led to graded BOLD responses in auditory cortex.
  • Low-level statistics significantly impacted response magnitude.
  • Increased functional connectivity between hippocampus and auditory cortex observed for less natural textures.

Conclusions:

  • Sensitivity to sound texture statistics is distributed across the auditory cortex.
  • MTL regions show modulation, suggesting a modulatory role under ambiguity.
  • Hippocampal-auditory interactions are important for processing degraded or unnatural sound textures.