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Related Concept Videos

The Cochlea01:13

The Cochlea

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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.
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Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Sound Intensity Level00:53

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Perception of Sound Waves01:01

Perception of Sound Waves

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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.
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Sensation01:21

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Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
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Auditory Pathway01:15

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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.
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Related Experiment Video

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A Low Cost Setup for Behavioral Audiometry in Rodents
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The rapid decline in interaural-time-difference sensitivity for pure tones can be explained by peripheral filtering.

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    Biorxiv : the Preprint Server for Biology
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    The auditory system

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics

    Background:

    • Interaural time difference (ITD) is crucial for horizontal sound localization.
    • ITD sensitivity is limited to frequencies below approximately 1400 Hz, with a sharp decline above 700 Hz.
    • The physiological basis for this rapid decline in ITD sensitivity remains unclear.

    Approach:

    • Investigated ITD sensitivity in 16 normal-hearing listeners across frequencies from 900-1500 Hz and sensation levels of 10-50 dB.
    • Measured ITD sensitivity as a function of frequency and sound level.

    Key Points:

    • ITD sensitivity decreased significantly with increasing frequency and decreasing sound level.
    • The observed slope of performance decline (90 dB/octave) aligns with the low-frequency slope of the cochlear excitation pattern.
    • This suggests peripheral encoding, not central limitations, dictates the rapid decline in ITD sensitivity.

    Conclusions:

    • High-frequency ITD sensitivity may rely on off-frequency neuronal activation tuned to lower frequencies.
    • A simplified model proposes that neurons sensitive to fine-structure ITDs might be limited to around 700 Hz.
    • This challenges traditional models of binaural processing that assume a wide range of frequency-tuned neurons.