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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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Hearing01:31

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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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Blind Procedures02:07

Blind Procedures

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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.
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...
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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.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Auditory Pathway01:15

Auditory Pathway

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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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Related Experiment Video

Updated: Aug 26, 2025

Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
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Do blind people hear better?

Carina J Sabourin1, Yaser Merrikhi2, Stephen G Lomber3

  • 1Department of Physiology, McGill University, Montreal, Quebec H3G 1Y6, Canada; Biological and Biomedical Engineering Graduate Program, McGill University, Montreal, Quebec H3G 1Y6, Canada.

Trends in Cognitive Sciences
|October 7, 2022
PubMed
Summary
This summary is machine-generated.

Early blindness enhances hearing abilities, with brain imaging showing visual cortex activation during auditory tasks. This suggests cross-modal plasticity and a task-based brain organization, offering insights into cortical plasticity mechanisms.

Keywords:
auditory processingcongenitally blindcrossmodal plasticityearly blindoccipital cortexvisual cortex

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Anecdotal evidence suggests superior hearing in early-blind individuals.
  • Cross-modal plasticity is a key area of study in neuroscience.
  • Understanding sensory reorganization provides insights into brain function.

Purpose of the Study:

  • To investigate auditory enhancements in early-blind individuals.
  • To explore the neural mechanisms underlying sensory reorganization.
  • To examine principles of cerebral organization in the context of blindness.

Main Methods:

  • Auditory psychophysical assessments.
  • Functional neuroimaging studies (e.g., fMRI).
  • Analysis of brain activity in response to auditory stimuli.

Main Results:

  • Early-blind individuals exhibit specific auditory enhancements.
  • Auditory tasks activate the extrastriate visual cortex in the early blind.
  • Observed sensory reorganization supports task-based functional cartography.

Conclusions:

  • Early blindness leads to cross-modal plasticity, repurposing visual cortex for auditory processing.
  • The brain exhibits a task-based functional organization rather than strict sensory segregation.
  • Studies of early-blind individuals illuminate mechanisms of cortical plasticity and brain organization principles.