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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.
Hearing01:31

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 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...
Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
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...
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...

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Related Experiment Video

Updated: Jul 3, 2026

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
09:38

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

Published on: January 29, 2014

Frequency changes in a continuous tone: auditory cortical potentials.

Andrew Dimitrijevic1, Henry J Michalewski, Fan-Gang Zeng

  • 1Department of Neurology, University of California, 150 Med Surge 1, Irvine, CA 92697, USA. adimitri@uci.edu

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|July 19, 2008
PubMed
Summary
This summary is machine-generated.

Auditory cortical potentials show distinct responses to low versus high frequency spectral changes. The N100 response is more pronounced for low frequencies, indicating differing central processing.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Electrophysiology

Background:

  • The auditory cortex processes complex spectral information.
  • Understanding frequency processing is crucial for auditory perception.

Purpose of the Study:

  • To investigate auditory cortical potentials in response to spectral changes in pure tones.
  • To compare the processing of low and high frequencies in the auditory cortex.

Main Methods:

  • Recording cortical potentials (N100, P200, slow negative wave) in normal hearing subjects.
  • Presenting continuous 250Hz and 4000Hz tones with random frequency increments (0-50%).

Main Results:

  • N100 amplitude and latency were significantly greater for low frequencies compared to high frequencies.
  • Dipole amplitudes were larger in the right hemisphere for both low and high base frequencies.
  • The slow negative wave amplitude did not correlate with the magnitude of spectral change.

Conclusions:

  • Auditory cortical processing of spectral changes differs between low and high frequencies.
  • Differences in processing may stem from peripheral auditory coding and temporal integration windows.