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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...

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 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 cochlea, a...

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...

Echo

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...

Sound as Pressure Waves

Sound as Pressure Waves

Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...

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Related Experiment Video

Updated: May 11, 2026

Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Temporal coherence and the streaming of complex sounds.

Shihab Shamma¹, Mounya Elhilali, Ling Ma

¹Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA. sas@umd.edu

Advances in Experimental Medicine and Biology

|May 30, 2013

Summary

Auditory stream formation, how we follow sounds, relies on temporal coherence of neural responses, not just separate neuron activation. Attention binds sound features into streams, segregating them from others.

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Published on: May 19, 2016

Area of Science:

Auditory Neuroscience
Computational Auditory Neuroscience
Psychoacoustics

Background:

Humans can selectively attend to and follow specific sounds amidst multiple auditory sources.
The neural mechanisms underlying auditory stream segregation remain largely unknown.
Previous theories suggested pre-attentive segregation based on well-separated neural populations.

Purpose of the Study:

To propose and computationally model a new hypothesis for auditory stream formation.
To investigate the role of temporal coherence in binding sound features into perceptual streams.
To explore the influence of attention on auditory stream segregation.

Main Methods:

Developed a computational model of auditory processing.
Included representational stages for early and cortical auditory processing.
Computed a coherence matrix to quantify correlations between neural responses encoding sound features.
Extracted segregated streams by decomposing the coherence matrix.

Main Results:

Simulations demonstrated that temporal coherence is crucial for auditory stream formation.
The model successfully disentangled complex sound sources like speech and music.
Attention was shown to play a key role in binding temporally coherent features into a single stream.

Conclusions:

Auditory stream formation is primarily driven by temporal coherence in neural responses.
Attention acts as a binding mechanism, integrating features of a sound source into a coherent stream.
The model provides a framework for understanding the neural basis of auditory perception and segregation.