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Auditory

Hearing
by

Hernan Martinez

on 16 November 2012

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Transcript of Auditory

Hearing Audition, or hearing, is highly adaptive just like our other senses. The Stimulus Input: Sound waves We Measure sound in decibels, with zero decibels representing the absolute threshold for hearing. People with normal hearing are sensitive to faint sounds. From thousands of human voices, we can recognize a friend on the phone, from the moment she says"Hi" Sound waves vary in shape. The amplitude of sound waves determines their loudness.Their length, or frequency, determines the pitch we experience. The Ear Sound travels through the 3 sections of the ear to the brain Outer Ear
Middle Ear
Inner Ear Outer ear channels the waves through the auditory canal enter the Eardrum. essential Question: What are the characteristics of air pressure waves that we hear as sound, and how does the ear transform sound energy into neural messages? Vibration of the sound waves goes through the canal and continue all in the inner ear How do we perceive Pitch? What theories help us understand pitch Perception? Place theory Hermann von Helmholtz's place theory presumes that we hear different pitches because different sound waves trigger activity at different places along the cochlea's basilar membrane. Place theory can explain how we hear high-pitched sounds but not low-pitched sounds Frequency theory This alternative theory states that the brain reads pitch by monitoring the frequency of neural impulses traveling up the auditory nerve. The Frequency theory best explains how we sense low pitches Locating Sounds How do we locate sounds We can tell which direction a sound is coming from because of our right hear, the right ear will receive the sound slightly faster than the left ear and the brain calculates this difference. Sound waves strike one ear sooner and more intensely than the other The ear uses parallel processing to analyze the differences in the sounds received by the two ears, and then finds the source. If the sound is directly behind or in front, where the distance between two ears is the same, then it is difficult to differentiate Hearing loss and deaf culture Conduction Deafness-loss of hearing due to damage of eardrum, and/or the tiny bones in middle hear. Long waves have low frequency and low pitch sound. Short waves have high frequency and high pitch sounds Sensor neural hearing loss- damage to the cochlea's receptors. Cochlear Implants Cochlear implants are the only way to restore hearing for people with nerve deafness These implants are wired to many sites on the auditory nerve, which allows them to transmit electrical impulses to the brain. Most effective when the child is very young Deaf People argue the implants since they do not view deafness as a disability, they also believe that the brain's plasticity allows a greater strength in another area
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