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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
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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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Auditory Perception01:17

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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...
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Simplified Synchronous Machine Model01:30

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The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
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Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
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C4 Pathway and CAM01:27

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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
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Optogenetic Stimulation of the Auditory Nerve
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Daytime sleepiness affects gait auditory synchronization ability.

G S Umemura, J P Pinho, A Forner-Cordero

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |November 17, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Daytime sleepiness, a symptom of sleep disturbances, impairs motor-auditory synchrony in gait. Individuals with high sleepiness showed greater synchronization errors, especially with non-isochronous rhythms, suggesting gait analysis could detect sleep issues.

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    Area of Science:

    • Neuroscience
    • Sleep Medicine
    • Biomechanics

    Background:

    • Modern lifestyles contribute to sleep disturbances, impacting cognitive and motor functions like gait.
    • Daytime sleepiness is a primary symptom, often quantified using the Epworth Sleep Scale (ESS).

    Purpose of the Study:

    • To investigate the effect of varying sleepiness levels on motor-auditory synchrony during rhythmic gait.
    • To determine if gait synchronization errors correlate with subjective sleepiness.

    Main Methods:

    • Participants were categorized into high sleepiness (HS) and low sleepiness (LS) groups based on ESS scores.
    • Gait synchronization was assessed on a treadmill under isochronous and non-isochronous auditory metronome conditions.
    • Synchronization error (SE) was measured using infrared cameras tracking heel markers relative to metronome beeps.

    Main Results:

    • A statistically significant tendency for the HS group to anticipate auditory beeps was observed in the non-isochronous condition compared to the LS group.
    • The high sleepiness group exhibited larger synchronization errors and relative phase differences.

    Conclusions:

    • Sleep disturbances leading to daytime sleepiness may negatively affect neural mechanisms controlling gait adjustments and attention.
    • Gait analysis, particularly synchronization error, shows potential for identifying sleep disturbances.