ITP - HEARING Flashcards
a unit expressing the frequency of a sound waves. One ____ equals one cycle per second.
Hertz (Hz)
A unit expressing the loudness of a sound
Decibels (dB)
Is the vibration of molecules in medium such as air or water
sound or auditory stimulation
2 psychological dimensions of a sound
Pitch
Loudness
is shaped and structured to capture sound waves, vibrate in sympathy with them.
ear
3 parts of the ear
outer
inner
middle
is shaped to funnel sound waves to the eardrum
Outer ear
three small bones
mallus - hammer
incus - anvil
stapes - stirrup
a thin membrane that vibrates in response to sound waves , and thereby transmits them to the middle and inner ears.
eardrum
contains the eardrum and three small bone, which also transmit sound by vibrating
middle ear
functions as an amplifier, increasing the pressure of the air entering the ear
middle ear
is attached to another vibrating membrane, the oval window
stirrup
Greek word for cochlea
snail
works in conjunction with the round window, which balances the pressure in the inner ear.
oval window
a membrane that lies coiled within the cochlea
basilar membrane
sometimes referred to as the “command post” of hearing. It is the receptor of hearing that lies on the basilar membrane in the cochlea
organ of the Corti
the inner ear, the bony tube that contains the basilar membrane and the organ of Corti
cochlea
the axon bundle that transmits neural impulses from the organ of Corti to the brain
auditory nerve
16, 000 receptors called _____. It dance in response to the vibrations of the basilar membrane
hair cells
three processes
Place theory
Frequency Theory
Volley Principle
Pitch is sensed according to place that vibrates
Place theory
he helped develop the place theory of pitch discrimination as well as the trichromatic theory of color vision.
Hermann von Helmholtz
Pitch perceived on stimulation of impulses that match the frequency of the sound
Frequency theory
Pitch is discriminated through alternate firing of neurons
Volley Principle
he found that receptors at diff sites along the membrane fire in response to tones of differing frequencies.
Georg von Bekesy