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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...

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...

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...

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Related Experiment Video

Updated: Jul 9, 2026

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities

Published on: January 29, 2014

Profile of auditory temporal processing in older listeners.

S Gordon-Salant¹, P J Fitzgibbons

¹Department of Speech & Hearing Sciences, University of Maryland, College Park 20742, USA. sgordon@bss1.umd.edu

Journal of Speech, Language, and Hearing Research : JSLHR

|May 6, 1999

Summary

Older adults show distinct auditory temporal processing differences compared to younger adults, especially with complex sounds. These age-related changes in temporal processing are key for distinguishing listener groups, including those with hearing loss.

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Area of Science:

Auditory Neuroscience
Psychoacoustics
Speech Perception

Background:

Age-related changes in auditory processing are well-documented.
Temporal processing is crucial for understanding speech and complex acoustic signals.
Distinguishing age and hearing loss effects on auditory perception is important for diagnostics.

Purpose of the Study:

To identify age-related performance differences in temporal processing of speech and nonspeech stimuli.
To find measures that effectively differentiate younger and older listeners, with and without hearing loss.
To develop a classification formula based on temporal performance.

Main Methods:

Evaluated temporal manipulation (duration, order) of simple and complex nonspeech signals.
Assessed speech perception under various conditions: time-compressed, reverberant, and combined, in quiet and noise.
Utilized discriminant function analysis to identify key differentiating measures.

Main Results:

Significant age effects were found in nonspeech measures, particularly with complex stimuli.
Age effects were evident in time-compressed and some reverberant speech conditions, in both quiet and noise.
Hearing loss effects were observed only for speech measures, while complex temporal manipulations were most discriminative.

Conclusions:

Temporal processing of complex speech and nonspeech signals effectively distinguishes age and hearing loss categories.
Specific temporally mediated measures are valuable for assessing age-related auditory performance changes.
The findings support the use of complex temporal tasks for listener classification.