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Related Concept Videos

Perception of Sound Waves01:01

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...
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...
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.
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...

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Related Experiment Video

Updated: May 12, 2026

A Low Cost Setup for Behavioral Audiometry in Rodents
09:23

A Low Cost Setup for Behavioral Audiometry in Rodents

Published on: October 16, 2012

Can the tinnitus spectrum identify tinnitus subgroups?

Karin M Heijneman1, Emile de Kleine, Esther Wiersinga-Post

  • 1Department of Otorhinolaryngology/Head and Neck Surgery, University Medical Center Groningen, The Netherlands.

Noise & Health
|April 11, 2013
PubMed
Summary

The tinnitus spectrum offers unique insights beyond standard audiograms, revealing distinct tinnitus patterns. This psycho-acoustic metric may help differentiate tinnitus types for tailored management.

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09:44

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Area of Science:

  • Audiology
  • Psycho-acoustics
  • Otolaryngology

Background:

  • The tinnitus spectrum, a psycho-acoustic metric, has shown a strong correlation with the tone audiogram.
  • This suggests limited added value of the tinnitus spectrum over traditional audiometry.

Purpose of the Study:

  • To investigate if the tinnitus spectrum reveals characteristics not inferable from the tone audiogram.
  • To explore the potential of the tinnitus spectrum in classifying tinnitus types.

Main Methods:

  • Re-examined the relationship between tinnitus spectrum and tone audiogram in 80 tinnitus patients.
  • Classified patients into three subgroups based on tinnitus spectrum shape: increasing, peaked, and other (typically low-frequency).

Main Results:

  • All groups exhibited maximum hearing loss at high frequencies (>2 kHz).
  • Group 3 (other) showed additional hearing loss at low frequencies (<2 kHz).
  • The tinnitus spectrum shape differed from the tone audiogram in subgroups 2 and 3, indicating unique information.

Conclusions:

  • The tinnitus spectrum provides information beyond standard tone audiometry.
  • Spectrum measurement may differentiate tinnitus classes, aiding in personalized therapeutic interventions.
  • This technique holds potential for improved tinnitus management strategies.