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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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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 larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
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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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Phonological processing in speech perception: What do sonority differences tell us?

Isabelle Deschamps1, Shari R Baum2, Vincent L Gracco3

  • 1Centre for Research on Brain, Language and Music, Rabinovitch House, McGill University, 3640 rue de la Montagne, Montreal, Quebec H3G 2A8, Canada; Rehabilitation Department, Laval University, Quebec, QC, Canada; Centre de Recherche de l'Institut Universitaire en santé mentale de Québec, Quebec, QC, Canada.

Brain and Language
|July 18, 2015
PubMed
Summary
This summary is machine-generated.

Brain regions involved in phonological processing are sensitive to stimulus modality and task demands. The posterior inferior frontal gyrus (IFGpo) showed sensitivity to phonological complexity, but only for visual stimuli.

Keywords:
Functional magnetic resonance imagingPhonological processingSonority differencesSpeech perception

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • The inferior frontal and posterior temporal brain regions are known to be involved in phonological processing.
  • Understanding the specific contributions of these regions to phonological processing is crucial for comprehending speech perception.

Purpose of the Study:

  • To investigate how specific brain regions, namely the inferior frontal and posterior temporal areas, contribute to phonological processing.
  • To examine the effects of manipulated subsyllabic phonological complexity and stimulus modality (visual vs. auditory) on brain activity during speech perception using functional magnetic resonance imaging (fMRI).

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to monitor brain activity.
  • Participants passively attended to visual or auditory pseudowords with varying levels of subsyllabic phonological complexity.
  • Analyses included whole-brain and region of interest (ROI) approaches, focusing on the inferior frontal gyrus (IFG) and posterior temporal regions.

Main Results:

  • A bilateral network of cortical regions was activated by both visual and auditory pseudowords, consistent with previous research.
  • Pseudowords engaged similar brain networks as words and letters.
  • Few brain regions showed phonological complexity effects independent of stimulus modality in whole-brain analyses.
  • Region of interest (ROI) analysis revealed that the posterior part of the inferior frontal gyrus (IFGpo) was sensitive to phonological complexity, but this effect was specific to print (visual) stimuli.

Conclusions:

  • The sensitivity of brain areas associated with phonological processing is influenced by the modality of stimulus presentation (visual vs. auditory).
  • Task demands, as manipulated by phonological complexity, also play a role in modulating neural responses in these regions.
  • The posterior inferior frontal gyrus (IFGpo) demonstrates modality-specific sensitivity to phonological complexity, particularly for visual input.