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Related Concept Videos

Auditory Perception01:17

Auditory Perception

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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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The Cochlea01:13

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Perception of Sound Waves01:01

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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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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
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Auditory adaptation improves tactile frequency perception.

Lexi E Crommett1, Alexis Pérez-Bellido1, Jeffrey M Yau2

  • 1Department of Neuroscience, Baylor College of Medicine, Houston, Texas.

Journal of Neurophysiology
|January 13, 2017
PubMed
Summary
This summary is machine-generated.

Auditory signals can improve tactile frequency perception. This crossmodal effect suggests that the brain uses shared neural circuits for processing both auditory and tactile frequency information.

Keywords:
audio-tactilecrossmodalmultisensorysomatosensory

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Crossmodal Interactions

Background:

  • Tactile perception of temporal frequency is crucial for texture discrimination.
  • Auditory signals, rich in temporal frequency information, can influence tactile perception.
  • The neural basis for crossmodal auditory-tactile interactions in frequency processing remains unclear.

Purpose of the Study:

  • To investigate if tactile frequency perception relies on neural circuits shared with auditory processing.
  • To test the hypothesis of crossmodal transfer of adaptation effects between audition and touch.
  • To determine if auditory adaptation specifically impacts tactile frequency discrimination.

Main Methods:

  • Employed a crossmodal adaptation paradigm with temporally separated auditory and tactile stimuli.
  • Investigated auditory adaptation effects on tactile frequency discrimination thresholds.
  • Assessed the specificity of auditory adaptation on tactile judgments (frequency vs. intensity).

Main Results:

  • Auditory adaptation significantly improved tactile frequency discrimination thresholds.
  • This improvement was frequency- and feature-specific, occurring only when adaptor and test frequencies overlapped.
  • Auditory adaptation did not affect tactile intensity judgments, indicating modality- and feature-specific interactions.

Conclusions:

  • Neural circuits for tactile frequency perception are likely shared with auditory processing.
  • This finding supports the concept of supramodal operators performing canonical computations across senses.
  • Crossmodal transfer of adaptation effects demonstrates a functional link between auditory and tactile frequency processing.