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Related Concept Videos

Auditory Perception01:17

Auditory Perception

1.5K
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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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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...
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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.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Factors Affecting Perception01:25

Factors Affecting Perception

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...
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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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Infant Auditory Processing and Event-related Brain Oscillations
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Age-related changes in auditory and visual interactions in temporal rate perception.

Cassandra J Brooks, Andrew J Anderson, Neil W Roach

    Journal of Vision
    |December 2, 2015
    PubMed
    Summary

    Healthy aging preserves the brain's ability to integrate sensory information, like auditory and visual rates. However, aging diminishes the benefits of combining synchronized sensory inputs for improved performance.

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    Area of Science:

    • Multisensory integration
    • Auditory perception
    • Visual perception
    • Human aging

    Background:

    • Aging impacts sensory processing, potentially affecting how the brain combines information from different senses.
    • Previous research suggests age-related declines in auditory and visual temporal processing.
    • Understanding how sensory reliability influences multisensory integration in older adults is crucial.

    Purpose of the Study:

    • To investigate the effect of healthy aging on the integration of auditory and visual temporal rate information.
    • To determine if age-related sensory differences alter multisensory integration when sensory reliability is normalized.
    • To examine how aging affects the benefits of integrating synchronous versus asynchronous sensory information.

    Main Methods:

    • Participants (younger and older adults) judged the temporal rate of auditory flutter and visual flicker.
    • Stimulus parameters were adjusted to equate the discriminability of temporal rates across sensory modalities and age groups.
    • Auditory and visual stimuli were presented synchronously or asynchronously to assess integration effects on rate judgments and discrimination.

    Main Results:

    • When sensory reliability was normalized, age did not affect the weighting of auditory versus visual temporal rate information.
    • Rate asynchrony similarly biased auditory and visual rate judgments in both younger and older adults.
    • Older adults did not show the performance improvement observed in younger adults when integrating synchronous auditory and visual rates.

    Conclusions:

    • Healthy aging does not impair the fundamental process of reliability-based weighting in multisensory temporal integration.
    • Age-related sensory deficits, when accounted for, do not alter the integration of discrepant auditory and visual temporal rates.
    • Aging eliminates the enhancement in temporal rate discrimination typically gained from integrating concordant sensory information.