Amplitude of sound loudness a measured in decibels

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IV. Amplitude of Sound (loudness) a. Measured in decibels (dbs) b. Example: 60 is normal conservation; 150 is jet plane c. TIDBIT: Increase from 60 to 70 increases amplitude 10 times (hence use of deci ) d. Perspective: d.i. Normal range of hearing: hear between 0 and 140 dB d.ii. Whisper: 25-30 dB d.iii. Conservation range between 45 and 60 db d.iv. Louder than 90 Ouch! d.v. 120 and above: pain (temporary or permanent hearing loss)
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V. Receptors a. Hair cells located in the inner ear b. Absolute Threshold: smallest amount of energy we can perceive 50% of the time b.i. Ticking of a watch at 20 feet in a quiet room b.ii. Weber’s K 1/10 for loudness VI. Types of Hearing Loss a. Conductive Hearing Loss: stops sound from getting through outer and middle ear (could simply be ear wax) b. Sensorineural Hearing Loss: problem in inner ear or hearing nerve (actual damage to the nerve) c. Mixed Hearing Loss: combination of the two VII. Locating Sound a. Time Delay b. Shadow Cue: sound is going through the face, and because it is hitting an object (face) it sounds a bit differently when it reaches the other side?
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  • Fall '12
  • Palladino
  • Psychology, Conductive hearing loss, Sensorineural Hearing Loss

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