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Related Concept Videos

Synesthesia01:27

Synesthesia

921
Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
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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

Hearing

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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 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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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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The Cochlea01:13

The Cochlea

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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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Related Experiment Video

Updated: Apr 16, 2026

Training Synesthetic Letter-color Associations by Reading in Color
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Auditory synesthesias.

Pegah Afra1

  • 1Department of Neurology, School of Medicine, University of Utah, Salt Lake City, UT, USA.

Handbook of Clinical Neurology
|March 2, 2015
PubMed
Summary

Synesthesia involves experiencing sensations in one modality due to stimulation in another. Auditory synesthesia (AS) has three types: developmental, acquired, and induced, each with distinct characteristics and potential neural mechanisms.

Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Synesthesia is a neurological phenomenon where sensory stimuli trigger experiences in a different sensory modality.
  • Auditory synesthesias (AS) are a subset where auditory stimuli elicit concurrent sensations or non-auditory stimuli trigger auditory perceptions.
  • AS are classified into developmental, acquired, and induced types.

Purpose of the Study:

  • To discuss the three distinct types of auditory synesthesia.
  • To explore the characteristics and phenomenological differences between AS types.
  • To review the potential neural mechanisms underlying auditory synesthesia.

Main Methods:

  • Literature review and synthesis of existing research on auditory synesthesia.
Keywords:
auditoryconcurrentcross-modalinducersynesthesia

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  • Categorization of AS based on etiology (developmental, acquired, induced).
  • Analysis of phenomenological descriptions and reported associations.

    • Main Results:

    • Developmental AS are consistent, lifelong, and not indicative of neurological disorder.
    • Acquired AS are linked to neurological conditions (lesions, deafferentation), epilepsy, migraine, and mood disorders.
    • Induced AS can result from experimental conditions (blindfolding) or substance intake (hallucinogens).

    Conclusions:

    • Auditory synesthesia presents diverse forms with varying origins and clinical associations.
    • Understanding the distinctions between AS types is crucial for accurate diagnosis and research.
    • Further investigation into neural mechanisms is needed to fully elucidate synesthesia.