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Auditory Perception

Auditory Perception

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...

Perception of Sound Waves

Perception of Sound Waves

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...

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

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...

Auditory Pathway

Auditory Pathway

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...

Hearing

Hearing

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.

Higher Mental Functions of the Brain: Language

Higher Mental Functions of the Brain: Language

Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...

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Related Experiment Video

Updated: Feb 16, 2026

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Published on: June 14, 2014

An interactive model of auditory-motor speech perception.

Einat Liebenthal¹, Riikka Möttönen²

¹Department of Psychiatry, Brigham & Women's Hospital, Harvard Medical School, Boston, USA.

Brain and Language

|December 23, 2017

Summary

Speech perception involves auditory and motor areas interacting early, supporting an interactive model. This challenges previous models by highlighting simultaneous activation before 100 ms.

Keywords:

ECoG EEG Intracranial MEG Sensorimotor Speech TMS

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Last Updated: Feb 16, 2026

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

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Published on: June 14, 2014

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Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception

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Published on: August 9, 2024

Area of Science:

Neuroscience
Cognitive Science
Speech Processing

Background:

The dorsal auditory stream is implicated in speech perception, connecting auditory and articulatory regions.
Models of speech perception often overlook the temporal dynamics of neural activation in auditory, somatosensory, and motor areas.
Understanding the timing of these activations is crucial for accurate speech processing models.

Purpose of the Study:

To critically review the literature on temporal information in auditory-motor speech processing.
To contrast parallel, hierarchical, and interactive models of speech perception.
To propose a novel interactive model of auditory-motor speech perception.

Main Methods:

Literature review focusing on temporal aspects of speech processing.
Analysis of electrophysiological and transcranial magnetic stimulation (TMS) studies.
Contrast of existing auditory-motor speech processing models.

Main Results:

Electrophysiological and TMS studies support an interactive model of speech perception.
Auditory and somatomotor areas are activated nearly simultaneously, within 100 ms.
Early interactions between auditory and motor regions provide evidence for rapid integration.

Conclusions:

A new interactive model of auditory-motor speech perception is proposed, emphasizing early connectivity.
Auditory and articulatory somatomotor areas interact from the initial stages of speech processing.
Factors like attention modulate the timing and strength of auditory-motor interactions, warranting further investigation.