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

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


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

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

4 The Intensity of Some Common Sounds

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


7 Ear is divided into 3 parts zOuter zMiddle zInner zSee diagram

8 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

9 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

10 I am sound, where do I go? zEar canal to Eardrum (vibrations) zPiston - HAS yHammer yAnvil yStirrup zCochlea yMovement of Hair cells - basilar membrane yAuditory nerve zNeural message to the brain yThalamus yAuditory cortex of Temporal lobe

11 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

12 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

13 How We Locate Sounds?

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

15 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

16 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

17 Audition  Older people tend to hear low frequencies well but suffer hearing loss for high frequencies 1 time 10 times 100 times 1000 times Frequency of tone in waves per second LowPitchHigh Amplitude required for perception relative to year-old group

18 zCochlea implants - clip on Amazing brain zSign language

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