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PSYC 230 UIUC EXAM 2 (Questions With Verified Answers) Latest update 2025
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PSYC 230 UIUC EXAM 2 (Questions With Verified Answers) Latest update 2025
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SCORE MOREPSYC 230 UIUC EXAM 2 (Questions With
Verified Answers) Latest update 2025
Sound stimulus
the periodic variations in air pressure traveling out from the source
Sound waves
the waves of pressure changes that occur in the air as a function of the vibration of a source
Medium of sound
A material (solid, liquid, or gas, or combination of these) through which a wave travels. In water, sound
travels 4x faster than it does through air.
pure tones
A sound wave in which changes in air pressure follow a sine wave pattern.
amplitude
the difference between the peak and the baseline of a wave (height of wave).
loudness
Perceptual experience of amplitude
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Loud sounds can be dangerous
Prolonged contact to sounds over 85 dB can eventually cause hearing loss. Sounds louder than 120 dB
are painful. Sounds louder than 130 dB will generally result in immediate and permanent hearing loss.
Frequency
The number of cycles in a sound stimulus that occur in 1 second
Pitch
The subjective experience of frequency
what unit is used to measure sound amplitude?
Hertz (Hz)
What is the hearing range of humans and how does it change with age?
20-20,000 Hz. As people age, hearing in the highest range dissipates. Lowest frequencies tend to remain
stable with age.
Outer ear
Pinna, external auditory canal, tympanic membrane (eardrum)
Pinna
Collects sound and funnels it into the auditory canal
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External auditory canal
conducts sound to the tympanic membrane, amplifies specific sound frequencies.
Tympanic membrane (eardrum)
Thin elastic sheet.
Middle ear
Eustachian tube
Tensor tympani
Stapedius
Ossicles:
Malleus (hammer)
Incus (anvil)
Stapes (stirrup)
Eustachian tube
Connects the middle ear with the pharynx. Equalizes air pressure on either side of the eardrum
Tensor tympani and Stapedius
Muscles attached to the malleus and stapes
Incus (anvil)
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