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Related Concept Videos

The Cochlea01:13

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.
Passive Filters01:27

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
Scaling01:26

Scaling

In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
Perceiving Loudness, Pitch, and Location01:21

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...
Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
Auditory Pathway01:15

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...

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Related Experiment Video

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

Published on: February 19, 2014

Auditory filter width affects response magnitude but not frequency specificity in auditory cortex.

Björn Herrmann1, Molly J Henry, Mathias Scharinger

  • 1Max Planck Research Group "Auditory Cognition", Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1A, 04103 Leipzig, Germany.

Hearing Research
|July 24, 2013
PubMed
Summary
This summary is machine-generated.

Aging preserves peripheral frequency selectivity but alters auditory cortex responses. Older adults show intact frequency analysis, with neural gain compensating for wider auditory filters.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Aging Research

Background:

  • Spectral analysis of sound occurs in the auditory periphery (frequency selectivity) and auditory cortex (frequency specificity).
  • Frequency selectivity is studied via auditory filter models, while frequency specificity is assessed using neural adaptation of the N1 response in electroencephalography (EEG).
  • The impact of aging on frequency-specific adaptation and the link between peripheral and neural frequency processing remain underexplored.

Purpose of the Study:

  • To investigate the effects of normal aging on frequency-specific neural adaptation in the auditory cortex.
  • To examine the relationship between peripheral frequency selectivity and neural frequency specificity across different age groups.
  • To determine if age-related changes in auditory filters influence neural processing in the auditory cortex.

Main Methods:

  • A psychophysical notched noise experiment was used to estimate auditory filters in younger (20-31 years) and older (49-63 years) normal-hearing participants.
  • An EEG experiment measured N1 response adaptation to assess frequency-specific neural processing in the auditory cortex.
  • Auditory filter shapes and N1 adaptation patterns were compared between the age groups.

Main Results:

  • Auditory filter shapes were comparable between younger and older adults, indicating intact peripheral frequency selectivity with normal aging.
  • Both age groups exhibited frequency-specific N1 adaptation that varied with spectral variance, with larger overall N1 amplitudes in older adults.
  • Overall N1 amplitude, but not frequency-specific adaptation, correlated with the auditory filter's pass-band.

Conclusions:

  • Normal aging maintains peripheral frequency selectivity but leads to age-related differences in auditory cortex processing.
  • A dissociation exists between peripheral frequency selectivity and neural frequency specificity in aging.
  • Widened auditory filters in older adults appear to be compensated by increased response gain in frequency-specific auditory cortical areas.