Sensing vibrations
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Sensing Vibrations. Sensing Vibrations. Basilar membrane measures the amplitude and frequency of sound waves amplitude ( loudness ) - magnitude of displacement of the basilar membrane. frequency (pitch) - frequency and location of displacements of the basilar membrane. Sensing Vibrations.

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Sensing Vibrations

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Sensing vibrations

Sensing Vibrations


Sensing vibrations1

Sensing Vibrations

  • Basilar membrane measures the amplitude and frequency of sound waves

    • amplitude (loudness) - magnitude of displacement of the basilar membrane

  • frequency (pitch) - frequency and location of displacements of the basilar membrane


Sensing vibrations2

Sensing Vibrations

  • Basilar membrane measures the amplitude and frequency of sound waves

  • frequency (pitch) - frequency and location of displacements of the basilar membrane


Sensing vibrations3

Sensing Vibrations

  • Bundles of “hair cells” are embedded in basilar membrane


Sensing vibrations4

Sensing Vibrations

  • When hair cells sway back and forth, they let charges inside

  • This flow of charges is converted to action potentials and sent along the auditory pathway


The auditory pathway

The Auditory Pathway

  • The auditory pathway is complex and involves several “stations” along the way to the auditory cortex in the brain

  • Lots of processing must be done in real-time on auditory signals!


How can you localize sound

How Can You Localize Sound?

  • Ponder this:

    • Imagine digging two trenches in the sand beside a lake so that water can flow into them. Now imagine hanging a piece of cloth in the water in each trench. Your job is to determine the number and location and type of every fish, duck, person, boat, etc. simply by examining the motion of the cloth. That’s what your auditory system does!

- Al Bregman


How do we stay balanced

How do we Stay Balanced?

The Vestibular System


Vestibular system balance

Vestibular System (Balance)


Vestibular system balance1

Vestibular System (Balance)


Vestibular system balance2

Vestibular System (Balance)


Vestibular system balance3

Vestibular System (Balance)

Head accelerates this way

Fluid goes this way

Cupula gets

pushed


Vestibular system balance4

Vestibular System (Balance)

Fluid goes this way

Head accelerates this way

Cupula gets

pushed


Vestibular system balance5

Vestibular System (Balance)

  • movement of the cupula is detected by hair cells

  • hair cells in the vestibular system are more sensitive than hair cells on the basilar membrane!


Vestibular visual and proprioceptive systems work together

Vestibular, Visual, and Proprioceptive Systems Work Together

  • Try standing on one foot with your eyes closed!


Fun facts about the vestibular system

Fun Facts about The Vestibular System

  • Seasickness arises when the vestibular system and the visual system send conflicting information


Fun facts about the vestibular system1

Fun Facts about The Vestibular System

  • Seasickness arises when the vestibular system and the visual system send conflicting information

  • People can be knocked down by moving walls!


Fun facts about the vestibular system2

Fun Facts about The Vestibular System

  • Seasickness arises when the vestibular system and the visual system send conflicting information

  • People can be knocked down by moving walls!

  • Alcohol causes the spins by (among other things) changing the density of the fluid in the semicircular canals


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