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Ted Petit (185)
Chapter 8

Chapter 8 - Detailed Textbook Notes

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Ted Petit

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Chapter 8Hearing and Language ProcessingAuditory SystemThe Properties of SoundSounds are vibrations of molecules in the air and a brain is required to hear itFrequency of cycles per unit in timeUsually measured in Hertz HzPerceptual DimensionpitchHumans can only perceive vibrations betwwn 20 and 20 000 HzPreferred Between 1000 and 4000 HzNot the same as speed Sound travels 340 msHigh frequencyhigh pitch Low frequencylow pitchDifferent animals can perceive at different pitcheshumans whales and dogs can detect a wide variety of frequenciesAmplitudeloudnessMeasured in decibels dBPeople with good hearing can detect sounds as quiet as 1 dBConversational Speech 4060 dBTimbreComplexity Fundamental frequency overtonesFournier analysisdissecting sound into many componentsThe EarTransductiontransforming subtle vibrations into neural signalsSoundEnters funnellike outer earpinnathe hole auditory meatus ear canalear drum tympanic membrane passes vibration 3 bones called ossicles malleus incus and stapesoval window cochleabending of basilar membranetectorial membrainelicits activity in hair cells receptors of auditory systemconnect with auditory nerveHair cells are functionally similar to rodscones in visual system3 anatomical divisions outer ear middle ear and inner earOuter earPinnaExternal Ear canalFunction to catch and amplify sound wavesMiddle EarChamber between tympanic membrane ear drum and the oval windowContents Ear drum ossicles 3 bones and the oval windowConversion of Sound wavesAir pressuremechanical energy Propagated and amplified along ossicles to the oval windowInner EarMechanical energyneural activityCochlea innerouter hair cells within cochleaInner hair cellsInner hair cells are what serve as the receptors for the auditory system even though there are 3 times more outer hair cellsPeople with intact outer hair cells but damage to inner will be deaf
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