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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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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 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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Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
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Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
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Perceptual training enhances temporal acuity for multisensory speech.

Matthew A De Niear1, Pranjal B Gupta2, Sarah H Baum3

  • 1Medical Scientist Training Program, Vanderbilt University Medical School, Vanderbilt University, Nashville, TN 37235, USA; Vanderbilt Brain Institute, Vanderbilt University Medical School, Vanderbilt University, Nashville, TN 37235, USA.

Neurobiology of Learning and Memory
|November 7, 2017
PubMed
Summary

Perceptual training can improve temporal acuity for audiovisual speech. However, training with simple stimuli does not enhance temporal acuity for complex speech stimuli, indicating limited generalization.

Keywords:
FeedbackMultisensoryPerceptionPerceptual learningPlasticitySpeechTraining

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Area of Science:

  • Auditory-visual sensory integration
  • Multisensory perception
  • Neuroplasticity

Background:

  • The temporal relationship between auditory and visual cues influences signal integration.
  • The window of perceived simultaneity (TBW) defines the time frame for binding asynchronous audiovisual stimuli.
  • Previous studies show perceptual training can enhance temporal acuity for simple audiovisual stimuli (e.g., flashes and beeps).

Purpose of the Study:

  • To investigate if perceptual training can alter temporal acuity for audiovisual speech.
  • To determine if training with simple or complex audiovisual stimuli generalizes across stimulus complexity levels.

Main Methods:

  • A simultaneity judgment (SJ) task was used to measure temporal acuity (TBW).
  • Participants underwent four consecutive days of perceptual training.
  • Temporal acuity was assessed before, immediately after, and one week following training.

Main Results:

  • Perceptual training with audiovisual speech stimuli enhanced temporal acuity for speech.
  • Changes in temporal acuity did not generalize across different levels of stimulus complexity.
  • Training effects on temporal acuity differed between simple and complex audiovisual stimuli.

Conclusions:

  • Perceptual training can enhance temporal acuity for audiovisual speech in adults.
  • The generalization of training-induced changes in temporal acuity is stimulus-dependent.
  • The dynamics of temporal acuity changes differ for simple versus complex audiovisual stimuli.