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8 Cards in this Set

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  • Back
  • 3rd side (hint)
What determines loudness and how is it measured?
Amplitude determines loudness and is measured in decibels.
Think stereo components
What determines pitch and how is it measured?
Frequency determines pitch and is measured in hertz.
how often; measurement rhymes with "Certz".
How does sound travel?
In waves from peak to peak - wavelengths
What is the general pathway that sound travels in the ear?
First, the pinna and auditory canal collect sound waves and guide them to the eardrum, causing it to vibrate. Secondly, the vibration of the eardrum vibrates the 3 bones of the middle ear, conducting the sound waves to the cochlea in the inner ear. Lastly, the sound waves cause movement of fluid in the cochlea, stimulating thousands of tiny, delicate hearing cells inside the cochlea to sway back and forth. The hair cells are connected to nerve fibers that join together to form the cochlear nerve. When the hairs move, they initiate nerve signals to travel the nerve which leads to the brain.
All three parts of the ear are involved in hearing. Start from the outside and move your way in. End in the brain.
What is the organ of hearing and how does it function?
Organ of Corti which is the most important part of the cochlea. It functions includes sensory hair cells. A row of 3500 inner hair cells generates the signals we hear and three rows of outer hair cells tune the cochlea to enhance its pitch discrimination.
How does an auditory nerve signal get created?
Vibrations in the ear move the basilar membrane of the cochlea up and down. As the hair cells move up and down, their sterocilia bend against the relatively stationary tectorial membrane above them. This opens K+ channels at the tip of each stereocilium and the inflow of K+ depolarizes the cell. This triggers neurotransmitter release, which initiates a nerve signal.
Includes depolarization of the cell and neurotransmitter release.
Briefly describe the auditory neuron pathway from the cochlea through to the brain.
The cochlear nerve joins the vestibular nerve to become cranial nerve VIII. Cochlear nerve fibers project to the pons and from there to the inferior colliculi of the midbrain then to the thalamus and finally the primary auditory cortex of the temporal lobes.
Does damage to the right or left auditory pathway cause unilateral damage? Why or why not?
No, because of extensive decussation in the Auditory pathway.