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Hearing (Do you hear what I hear?)

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Presentation on theme: "Hearing (Do you hear what I hear?)"— Presentation transcript:

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

2 Hearing Audition - the sense of hearing Measured in decibels
Absolute threshold - zero

3 The Intensity of Some Common Sounds

4 Audition Amplitude (strength) determines loudness Frequency
the number of wavelengths determines Pitch - a tone’s highness or lowness


6 Ear is divided into 3 parts
Outer Middle Inner See diagram

7 Audition- The Ear 1. 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

8 Audition 3. Inner Ear contains the cochlea, semicircular canals, and vestibular sacs Cochlea coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses Hair cells line the basilar membrane

9 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

10 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

11 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

12 How We Locate Sounds?

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

14 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

15 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 deafness Crunched the shag carpet - hair cells perm. damaged

16 Audition Older people tend to hear low frequencies well but suffer hearing loss for high frequencies 1 time 10 times 100 1000 32 64 128 256 512 1024 2048 4096 8192 16384 Frequency of tone in waves per second Low Pitch High Amplitude required for perception relative to 20-29 year-old group

17 Cochlea implants - clip on Amazing brain
Sign language

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