week 2 lesson 1 Flashcards
hearing and the ear (16 cards)
what are the 3 parts of the ear called
outer ear, middle ear, inner ear
what part is in the outer ear
pinna
what does the pinna do
filters and amplifies sounds waves and sends them along the ear canal
what do the sound waves do after going down the ear canal
hit the eardrum (tympanic membrane) making it vibrate
what happens in the middle ear
sound waves are amplified then delivered to the ossicles
what are the ossicles made up of
malleus, incus, stapes
what does the orientation of the bones help do
allows them to function as a lever to amply sound energy
what happens to the sound waves when it gets to the inner ear
the vibrations from the stapes push on the oval window and set up pressure waves in the fluid filled cochlea
what is inside the cochlea
fluid and the Organ of Corti
what happens in the organ of corti
vibrations are transformed into electrical energy by hair cells on basilar membrane
what lines the cochlea
tiny hair cells
what is the auditory cortex
part in the brain that decodes sounds to create meaning - what the sound is, how important the sound is, direction of the sound
how do the signals get to the auditory cortex
travel via the auditory nerve
what is place theory
how tones are perceived based on the specific place where the hair cells can detect it
which places do high and low frequencies belong to
high frequency - base of the cochlea
low frequency - the apex
what is frequency theory
hairs pick up any frequency and the amount of nerve impulses changes depending on the frequency
frequency = 100
neuron will fire 100 pulses
