module 10 hearing and other senses chapter 3, pages 108-120 essentials of understanding psychology-...
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Module 10Hearing and Other Senses
Chapter 3, Pages 108-120Essentials of Understanding Psychology- Sixth Edition
PSY110 Psychology
© Richard Goldman
October 9, 2006
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Ear
Converts sound waves into nerve pulses Senses motion Helps maintain balance
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Ear Structure
Outer Ear Pinna Auditory canal Eardrum (Tympanic
membrane) Middle Ear Ossicles (bones)
Hammer Anvil Stirrup Eustachian tube
Inner Ear Oval window Cochlea
Basilar membrane Hair cells Auditory nerve Semicircular canals (3) – motion
sensors Otoliths- orientation & acceleration
sensors
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Orientation &Acceleration
Otoliths
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Sound Compression wave (not transverse) that travels through a
medium Human can hear sound in the range of 20-20,000 Hz (cycles
per second) – pitch Amplitude – Intensity of sound – measured in decibels (a
10X logarithmic scale) – sounds greater than 120db is painful Sensitivity –
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Sound Waves
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Sound Localization
Differences in intensity and time differences between sound reaching each ear help the brain determine what direction the sound came from
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Theories of Hearing
Place Theory – Excitation of specific locations on the basilar is responsible for frequency discrimination
Frequency Theory – Excitation across the basilar membrane in sync with the sound is responsible for frequency discrimination
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Hearing Loss
Damage due to: Physical damage – cotton swab (Q-tip) Illness – Mumps Prolonged exposure to loud sound Brief exposure to very loud sound
My be corrected with: Hearing aid – auditory discrimination is often a
problem Cochlear implant
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Deaf Culture
Some people believe that belonging to a deaf culture is just a good as belonging to a hearing culture.
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Olfaction - Sense of Smell
Humans can detect > 10,000 separate smells 1,000 different specialized types of olfactory
cells Pheromones – secreted odors use to
communicate
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Gustation - Sense of Taste
Taste results from combinations of stimulating 4 different types of taste buds located on tongue, in mouth, and throat. Sweet Sour Salty Bitter
Humans have about 10,000 different taste buds
Each taste bud is replaced every 10 days
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Interrelation of Taste and Smell The perception of taste often relies on the
perception of smell to identify a food substance
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Skin Senses:
Touch Pressure Temperature Pain
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Pain
Gate-control theory - Pain is a perception under control of the brain
Treatments: Medication Electro stimulation of the nerve Light Therapy Hypnosis Surgery Cognitive Restructuring - Rewrite of the pain
“script”