Hearing 164 170
Download
1 / 14

Hearing 164-170 - PowerPoint PPT Presentation


  • 99 Views
  • Uploaded on

Hearing 164-170. Our auditory sense. Frequency the number of complete wavelengths that pass through point at a given time. This determines the pitch of a sound. Amplitude is how loud the sound is. The higher the crest of the wave is the louder the sound is. It is measured in decibels.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Hearing 164-170' - shellie-peterson


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Hearing 164 170
Hearing 164-170

Our auditory sense


Frequency the number of complete wavelengths that pass through point at a given time. This determines the pitch of a sound.


Amplitudeis how loud the sound is. The higher the crest of the wave is the louder the sound is. It is measured in decibels.



The path of sound
The Path of Sound

  • Outer Ear = collects sound waves

  • Middle Ear = amplifies

  • Inner Ear = Transduction happens


Outer ear
Outer Ear

Sound wave comes into ear and…

  • Pinna – helps pinpoint location of sound

  • Ear canal → eardrum = tightly stretched

    • membrane that vibrates when sound hits it


Middle ear
Middle Ear

  • The eardrum vibrates and then…

    • Ossicle bones = hammer, anvil, stirrup amplify vibration

    • Oval window = another membrane to inner ear


Inner ear
Inner Ear

  • Cochlea = fluid-filled, snail shaped tube. Vibrations cause movement in fluid

  • Basilar Membrane – hair cells on floor of cochlea. Bending of them stimulates the auditory nerve cells


Transduction in the ear
Transduction in the ear

  • Sound waves hit the eardrum anvil hammerstirrupoval window.

  • Everything is just vibrating.

  • Then the cochlea vibrates.

  • The cochlea is lined with mucus called basilar membrane.

  • In basilar membrane there are hair cells.

  • When hair cells vibrate they turn vibrations into neural impulses which are called organ of Corti.

  • Sent then to thalamus up auditory nerve.

It is all about the vibrations!!!


Pitch theories
Pitch Theories

Place Theory and Frequency Theory


Helmholtz s place theory
Helmholtz’s Place Theory

  • Different hairs vibrate in the cochlea according to different pitches.

  • So some hairs vibrate when they hear high and other vibrate when they hear low pitches.


Frequency theory
Frequency Theory

  • All the hairs vibrate but at different speeds.

  • But this theory has trouble explaining high pitch sounds because our hairs cannot vibrate at certain speeds.


Deafness
Deafness

Conduction Deafness

Nerve (sensorineural) Deafness

The hair cells in the cochlea get damaged.

Loud noises can cause this type of deafness.

NO WAY to replace the hairs.

Cochlea implant is possible.

  • Something goes wrong with the sound and the vibration on the way to the cochlea.

  • You can replace the bones or get a hearing aid to help.


ad