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Related Concept Videos

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 identifying...

The Cochlea

The Cochlea

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.

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.

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 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 frequency...

Hair Cells

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.

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Related Experiment Video

Updated: Jul 14, 2026

Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Tuning to sound frequency in auditory field potentials.

Christoph Kayser¹, Christopher I Petkov, Nikos K Logothetis

¹Max Planck Institute for Biological Cybernetics, Speemannstr. 38, 72076 Tuebingen, Germany. Christoph.kayser@tuebingen.mpg.de

Journal of Neurophysiology

|June 29, 2007

Summary

Auditory cortex neurons show frequency tuning. This study compares tuning in population signals, like local field potentials (LFPs), with single-neuron activity, finding high-frequency LFPs match neural tuning.

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Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Published on: February 19, 2014

Area of Science:

Neuroscience
Auditory Neuroscience
Computational Neuroscience

Background:

Auditory cortex neurons exhibit frequency selectivity.
Functional imaging methods assess auditory cortex organization using population signals.
The relationship between population signal tuning and single-neuron tuning is not fully understood.

Purpose of the Study:

To compare frequency tuning properties across different electrophysiological signals in the auditory cortex.
To investigate how population-level signals relate to single-neuron spiking activity.
To determine the suitability of various electrophysiological measures for reflecting sound frequency processing.

Main Methods:

Quantified frequency tuning properties of auditory-evoked potentials (AEPs).
Analyzed different frequency bands of local field potentials (LFPs).
Compared tuning of analog multi-unit activity (AMUA) and spike-sorted single- and multi-unit activity.

Main Results:

Analog multi-unit activity (AMUA) closely matched the frequency tuning of spike-sorted activity.
Local field potentials (LFPs) showed frequency-dependent tuning properties, with higher frequencies more similar to spiking activity.
Lower-frequency LFPs and auditory-evoked potentials (AEPs) displayed significant differences compared to spiking activity.

Conclusions:

Electrophysiological population responses vary in their frequency tuning fidelity.
High-frequency oscillatory activity in LFPs aligns well with neuronal processing of sound frequency.
Functional imaging methods linked to high-frequency oscillations may accurately reflect auditory cortex function.