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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

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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.
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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.
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Auditory Perception01:17

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

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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.
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Sound as Pressure Waves01:17

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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.
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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.
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A Two-interval Forced-choice Task for Multisensory Comparisons
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Illusory sound texture reveals multi-second statistical completion in auditory scene analysis.

Richard McWalter1,2,3, Josh H McDermott4,5,6,7

  • 1Department of Brain and Cognitive Sciences, MIT, Cambridge, MA, 02139, USA. mcwalter@mit.edu.

Nature Communications
|November 10, 2019
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Summary
This summary is machine-generated.

The brain can "fill in" missing auditory information by extrapolating background sound statistics over several seconds, creating illusory textures. This perceptual completion offers a stable representation of the environment despite interrupted sensory input.

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Area of Science:

  • Auditory Perception
  • Cognitive Neuroscience
  • Psychology

Background:

  • Perceptual systems maintain stable experiences of the world despite incomplete sensory data.
  • Auditory scenes are often interrupted, requiring mechanisms for perceptual completion.

Purpose of the Study:

  • To investigate a novel auditory filling-in phenomenon involving the extrapolation of background sound statistics.
  • To characterize the duration, nature, and representational properties of this illusory auditory texture.

Main Methods:

  • Participants listened to interrupted auditory textures (background sounds).
  • The study assessed participants' perception of illusory texture during sound interruptions.
  • Statistical properties of perceived illusory texture were compared to actual texture.

Main Results:

  • A long-lasting auditory filling-in phenomenon was demonstrated, where the brain extrapolates background sound statistics over several seconds.
  • This illusory texture is statistically defined and perceptually indistinguishable from actual texture.
  • The effect lasts significantly longer than previously described completion phenomena.

Conclusions:

  • The brain infers the continuation of background auditory statistics during concurrent sounds.
  • This auditory illusion suggests a mechanism for maintaining a stable statistical representation of the environment.
  • The findings provide insights into the neural basis of perceptual stability and auditory scene analysis.