Hearing and Balance (Chapter 6a)

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36 Terms

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Cochlea
________ is damaged- repeated bending /folding of the hair cells can cause them to break via overstimulation.
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DTI
________:: more axonal connections in a normal person vs someone who is (legitamately) tone deaf.
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neurons
Selective:: ________ at the front of the cochlea die which is where the amplitude comes in the harshest.
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Tinnitus
________:: ringing in the ears (like phantom limb pain)
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Primary auditory cortex
________:: inner portion of the temporal lobe.
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Nerve deafness
________:: abnormality w /in the inner ear.
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noise protection
Effects: ________, enhancing signal to noise ration, signal amplification, selective attention, adaptation to sound.
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Pitch
________:: the psychological perception of frequency (increased freq= increased ________)
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Inner hair cells
________ have potassium channels- when the tectorial membrane bends hair cell backwards, channel pops.
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Amplitude
________:: intensity of a sound wave, loudness is psychological perception of intensity.
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Amplitude
intensity of a sound wave, loudness is psychological perception of intensity
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Frequency
of compressions per second, measured in hertz (Hz)
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Pitch
the psychological perception of frequency (increased freq = increased pitch)
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External ear → ear canal → eardrum
tympanic membrane; flexible, semi-opaque, delicate
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3 ear ossicles
hammer, anvil, stirrup
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Fluid inside the cochlea
movement (sound) causes waves of fluid
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Coding of neuronal info in the scala media
scala tympani has the basilar membrane which will be pushed up by the waves of fluid; scala vestibuli also has waves of fluid (will change the most, amplitude of the wave will be biggest here after oval window)
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Inner hair cells have potassium channels
when the tectorial membrane bends hair cell backwards, channel pops
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Outer hair cells (3 distinct rows of hairs)
release ACh after an input of GABA
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Inner hair cells (1 distinct row of hairs)
glutamatergic and depolarize the cochlear nerve
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Effects
noise protection, enhancing signal to noise ration, signal amplification, selective attention, adaptation to sound
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Inferior colliculus
peripheral sound perception (midbrain)
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Medial geniculate nucleus
thalamus
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Primary auditory cortex
inner portion of the temporal lobe
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DTI
more axonal connections in a normal person vs someone who is (legitamately) tone deaf
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Conduction deafness
abnormality w/in the middle ear
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Nerve deafness
abnormality w/in the inner ear
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Cochlea is damaged
repeated bending/folding of the hair cells can cause them to break via overstimulation
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Selective
neurons at the front of the cochlea die which is where the amplitude comes in the harshest
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Damage could come from a repeated stimulation at a specific frequency (ex
jackhammer)
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Complete
born deaf, no hair cells at all
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Tinnitus
ringing in the ears (like phantom limb pain)
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Central deafness
deaf in the brain, extremely rare
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3 semicircular canals w/a jellylike substance and otoliths
almost like bone chip fragments
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Sit in different planes
helps us understand 3D space
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Guides our eyes and helps us maintain our balance
detects the position and movement of the head