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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...

Sound Intensity Level

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence 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...

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...

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.

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Related Experiment Video

Updated: Jun 12, 2026

A Method to Study Adaptation to Left-Right Reversed Audition

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

ERG alterations induced by sound.

G Nikitopoulou-Maratou¹, G A Vassiliou, M Kepetzis

¹Dpt. of Physiology, School of Medicine, Univ. of Athens, Athens 609, Greece.

Neurochemistry International

|May 22, 2010

Summary

This summary is machine-generated.

Sensory input, like sound, can influence human retinal responses. Simultaneous sound and light flashes increased the electroretinogram (ERG) b-wave, suggesting a novel sensory pathway.

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Area of Science:

Neuroscience
Ophthalmology
Sensory Integration

Background:

The existence of efferent neurons from the central nervous system (CNS) to the retina, mediating centrifugal effects, is a long-standing hypothesis.
Investigating cross-modal sensory influences on visual processing is crucial for understanding neural pathways.

Purpose of the Study:

To determine if human electroretinogram (ERG) responses to light can be modulated by concurrent auditory stimuli.
To characterize the properties of sound-induced modulations of the ERG b-wave.

Main Methods:

Recording human ERG responses to light flashes presented simultaneously with auditory stimuli.
Analyzing the characteristics of the ERG b-wave amplitude changes.
Conducting experiments on rabbits to investigate the pathway's resilience to anesthesia and muscle manipulation.

Main Results:

A significant increase in the ERG b-wave amplitude was observed when light flashes were paired with sound.
The sound-induced b-wave increment exhibited a short time course, habituation specific to sound frequency, and adaptation to sustained sounds.
The effect was dependent on sound localization cues and modulated by diazepam, showing enhancement at low doses and suppression at high doses.
Experiments in rabbits indicated the pathway is not abolished by ether anesthesia, atropine, or cutting external ocular muscles.

Conclusions:

The findings support the existence of a sensory pathway influencing retinal processing.
The results suggest a reticulo-retinal pathway, likely involved in modulating visual input, is responsible for these cross-modal effects.
This pathway may play a role in controlling the flow of visual information.