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Related Concept Videos

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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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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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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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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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 19, 2026

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
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Cracking the Dual Code: Toward a Unitary Model of Phoneme Identification.

Donald J Foss1, Morton Ann Gernsbacher1

  • 1University of Texas at Austin.

Journal of Verbal Learning and Verbal Behavior
|December 19, 2014
PubMed
Summary

The dual code model

Area of Science:

  • Cognitive Psychology
  • Speech Processing
  • Phonetics

Background:

  • The dual code model of phoneme identification suggests different processing codes based on task difficulty.
  • Previous research indicated semantic predictability influences speech code processing.
  • The phoneme monitoring task is a common tool for studying speech perception.

Purpose of the Study:

  • To test predictions of the dual code model of phoneme identification.
  • To investigate the role of sentence context and semantic predictability in speech processing.
  • To examine phonetic factors influencing speech code processing.

Main Methods:

  • Five experiments were conducted, manipulating task difficulty and stimuli.
  • Phoneme monitoring tasks were used to measure reaction times.

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  • Analysis included word/nonword status, phonetic structure, and semantic predictability.

    • Main Results:

    • Predictions from the dual code model were not sustained.
    • A nonword superiority effect was observed, which was accounted for by phonetic factors.
    • Vowel duration and other phonetic features significantly affected reaction times, independent of word status.

    Conclusions:

    • The dual code model's predictions regarding task difficulty and processing codes were not supported.
    • Phonetic factors, particularly vowel duration, play a significant role in speech processing and can explain previously observed effects.
    • The findings challenge models emphasizing semantic context and suggest re-evaluating the use of the phoneme monitoring task.