CSD 230 Exam 1 Flashcards

1
Q

Acoustics

A

Science of sound

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2
Q

Amplitude

A

Amount of vibration of a mass from the position of rest the farthest point from
the position of rest (up and down on chart)

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3
Q

Condensation

A

Region of a sound wave characterized by an increased density of molecules

Opposite of rarefaction

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4
Q

Damping

A

Decrease in the amplitude of a vibrating body over time

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5
Q

Decibel (dB)

A

Unit of sound intensity level

The logarithm of the pressure of a sound to a reference pressure (usually
0.0002 dynes/cm2)

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6
Q

Frequency

A

Number of complete cycles (or oscillations) of a vibrating body in a specified unit of time

Hertz (Hz)

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7
Q

Intensity

A

Magnitude of sound energy per unit area

Similar to volume
Force of a sound wave

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8
Q

Pitch

A

The psychological perception of frequency

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9
Q

Pure Tone

A

Single-frequency tonal sound

Aka a sinusoid

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10
Q

Refraction

A

Region of a sound wave characterized by an area of less dense molecules

Opposite of condensation

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11
Q

Resonance

A

Natural rate of vibration of a mass

Shatter a glass with a musical tone

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12
Q

Sound

A

Vibration through a medium (air/liquid)

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13
Q

Primary sections of the ear

A

outer, middle, inner, retrocochlear

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14
Q

Peripheral

Central

A

Outer ear
* Middle ear
* Inner ear
* CN (8)
* Cochlear nucleus on the brainstem

  • Rest of the brainstem
  • Cortex
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15
Q

Hearing Threshold

A

Softest intensity at which one can hear a sound
Frequency dependent

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16
Q

Pinna effect

A

loudness and intensity differences for localization

17
Q

a-

A

on, in, at

18
Q

genesis

A

origin/creation

19
Q

cephal

20
Q

dys

21
Q

-pathy

22
Q

oto

23
Q

media

24
Q

-rreha

25
Q

4th week of gestation

A

Ossicles start to develop
External gill groove starts to form
Start to see vestibular system

26
Q

38th Day of
Gestation

A

Differentiation of otic vesicle yields 3 major
subdivisions of the inner ear
* Endolymphatic sac
* Endolymphatic duct
* Utricular and saccular portions of the inner
ear

27
Q

Fifth to Sixth Week of Gestation

A

External ear begins to form
* Start to see the EAC
* External ears form from 6 thickenings
* “axon hillocks”
* Nasopharynx develops
* Upper lip develops
* Beginning of the semicircular canals
* 6th week

28
Q

7th Week of
Gestation

A

First full turn of the cochlea develops
Vestibular system is fairly developed
* Outer ear is visible

29
Q

9th week of gestation

A

2 ¼ turns of the cochlea and semi-circular
canal system are developed.
Ear is more upright and more forward on the
head.

30
Q

3rd month

A

Ossicles are formed, but still in fluid
A meatal plug forms at the bottom of the pharyngeal cleft.

31
Q

The cochlea is adult-like by _____ weeks of gestation, while the middle ear
continues to develop until the end of gestation.