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Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

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Page 1: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Myers PSYCHOLOGY

Hearing

(Do you hear what I hear?)

Page 2: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Hearing

Audition - the sense of hearing

Measured in decibels

Absolute threshold - zero

Page 3: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

The Intensity of Some Common Sounds

Page 4: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Audition

Amplitude (strength)determines loudness

Frequencythe number of wavelengths determines Pitch - a tone’s highness or lowness

Page 5: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)
Page 6: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Ear is divided into 3 parts

OuterMiddleInner

See diagram

Page 7: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Audition- The Ear1. Outer Ear - visible part & canal

2. Middle Ear - chamber between eardrum and cochlea HAS three tiny bones

HAS (like a piston - hammer, anvil, stirrup)

that concentrate the vibrations of the eardrum on the cochlea’s oval window

Page 8: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Audition3. Inner Ear

contains the cochlea, semicircular canals, and vestibular sacs

Cochleacoiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses

Hair cells line the basilar membrane

Page 9: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

I am sound, where do I go? Ear canal to Eardrum (vibrations) Piston - HAS

Hammer Anvil Stirrup

Cochlea Movement of Hair cells - basilar membrane Auditory nerve

Neural message to the brain Thalamus Auditory cortex of Temporal lobe

Page 10: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

How do we hear?

1. Place Theory (Helmholtz) the theory that links the pitch we hear

with the place where the cochlea’s membrane is stimulated;

best for high-pitched sounds

Page 11: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

How do we hear?

2. Frequency Theory the theory that the rate of nerve

impulses traveling up the auditory nerve matches the frequency of a tone, thus enabling us to sense its pitch;

best for low-pitched sounds

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How We Locate Sounds?

Page 13: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Locating sound

We locate sound by detecting differences in the intensity (loudness) and timing (speed) of the sounds received by each ear

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Why can’t I hear?1. Conduction Hearing Loss

hearing loss caused by damage to the mechanical system that conducts sound waves to the cochlea

Ex. Damage to eardrum, broken HAS

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Why can’t I hear?2. Sensorineural Hearing Loss

hearing loss caused by damage to the cochlea’s receptor cells or to the auditory nerve

also called nerve deafnessCrunched the shag carpet - hair cells perm. damaged

Page 16: Myers PSYCHOLOGY Hearing (Do you hear what I hear?)

Audition Older people tend to hear low frequencies well

but suffer hearing loss for high frequencies

1time

10times

100times

1000times

32 64 128 256 512 1024 2048 4096 8192 16384

Frequency of tone in waves per second

Low Pitch High

Amplitude required forperception relative to 20-29 year-old group

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Cochlea implants - clip on Amazing brain

Sign language