Outer ear

Question 0

What does the pinna do?

Answer 0

Gives a different freq response so we can localize a sound coming from the side

Question 1

Visible part is the ..

Answer 1

Pinna / auricle

Question 2

Less visible part …

Answer 2

The external auditory canal

Question 3

Deep centre portion ..

Answer 3

Concha

Question 4

Diameter of concha

Answer 4

1-2 cm

Question 5

What does concha do?

Answer 5

Leads to external auditory meatus

Question 6

How long is EAC?

Answer 6

2-3cm

Different people have diff lengths

Question 7

What makes up lateral portion of EAC?

Answer 7

Cartilage, containing glands that produce cerumen

Question 8

What makes up medial portion of EAC?

Answer 8

Bony, tight skin lining close to tympanic membrane

Lots of vessels and nerve endings

Question 9

Function of outer ear

Answer 9

Protection
Amplification
Localization

Question 10

Head related transfer function

Answer 10

At high freq sounds we lose more of the amplitude

High frequencies are amplitude cues

Question 11

Types of cues provided by the ear

Answer 11

Inter aural intensity cues

Inter aural timing cues

Question 12

Interaural intensity cues

Answer 12

Input is compared in terms of. Intensity

More effective for high freq’s

Question 13

Interaural timing cues

Answer 13

Input compared in terms of time of arrival

More effective for low freq’s

Question 14

Ear canal resonance

Answer 14

Biggest pressure gain is at the place where soft sounds have frequencies
The resonant characteristics of the ear canal amplify the speech frequencies