Hearing, Taste And Movement Flashcards
How are sound waves detected?
Pinna (outer ear)
Tympanic membrane (eardrum)
Cochlea (with 3 fluid filled tunnels)
Vibrations displace hair cells in cochlea
Auditory nerve (nerve bundle)
Where is the sound info processed in the brain?
Ear
Cochlear nucleus
crossover
Primary auditory cortex
What’s the place theory?
Distinguishing between frequencies
Each area of the basilar membrane refers to a specific pitch
BUT areas too tightly linked to resonate
What’s the frequency theory?
Distinguishing between frequencies
Vibrations of basilar membranes in sync with sound waves
BUT Neurons can’t fire quick enough
What’s the current view of distinguishing between frequencies?
Combination of both place theory and frequency theory
If the primary auditory cortex is damaged could it cause deafness?
Sound processing would be affected but not deafness
If the middle ear is damaged could it cause deafness?
Conductive deafness - damage of bones of the Middle ear
What happens with nerve deafness?
Damage of cochlea, hair cells
Inherited
How do the ears receive different information? (3)
Difference in time of arrival
Difference in intensity
Phase difference in sound waves
What’s the hearing range?
20hz to 20khz
What’s vestibular sensation?
Sensations of body rotation , gravitation and movement
What does the vestibular organ do and what’s it crucial for?
Detects position and movement of the head
Crucial for balance
What are the 3 semicircular canals of the vestibular organ?
Next to the inner ear
Filled with jelly like substance, lined with hair cells
How does vestibular sensation work?
Head moves
Within the 3 semicircular cans (jelly like substance moves)
Calcium carbonate particles move against hair cells
Brain stem
Cerebellum
Why are there 3 canals?
To represent the three dimensions