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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...
Auditory Perception01:17

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 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...
Hair Cells01:22

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.

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A Method to Study Adaptation to Left-Right Reversed Audition
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Binaural processing by the gecko auditory periphery.

Jakob Christensen-Dalsgaard1, Yezhong Tang, Catherine E Carr

  • 1Institute of Biology, University of Southern Denmark, Odense, Denmark.

Journal of Neurophysiology
|February 18, 2011
PubMed
Summary
This summary is machine-generated.

Gecko ears achieve remarkable sound directionality through coupled eardrums and mouth cavity resonances. Neural recordings confirm auditory nerve sensitivity to interaural time and level differences, reflecting this acoustic processing.

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Area of Science:

  • Bioacoustics
  • Neuroscience
  • Auditory system research

Background:

  • Lizards possess highly directional ears, crucial for sound localization.
  • This directionality results from strong acoustical coupling and efficient sound transmission between eardrums.

Purpose of the Study:

  • To investigate the neural mechanisms underlying directional hearing in geckos.
  • To correlate physical ear properties with auditory nerve responses.

Main Methods:

  • Biophysical measurements of Tokay gecko eardrum motion using laser vibrometry.
  • Neurophysiological recordings from the auditory nerve.

Main Results:

  • Gecko ears function as a two-input system with high interaural transmission gain (~1.6 kHz).
  • Measured interaural delays (260 μs) exceed predictions, suggesting mouth cavity resonance involvement.
  • Auditory nerve recordings show sensitivity to interaural time differences (ITD) and interaural level differences (ILD).
  • Blocking the mouth cavity eliminated ITD and ILD sensitivity in neural responses.

Conclusions:

  • The neural auditory response accurately reflects the physical tympanic directionality of the gecko ear.
  • Mouth cavity resonances play a significant role in enhancing interaural transmission delays.
  • Most neurons in the gecko auditory pathway are likely directional, processing spatial sound information.