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PSYC 2200- Mar 8.docx

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Department
Neuroscience
Course
NEUR 2200
Professor
All Professors
Semester
Winter

Description
HearingPhysiologyandPsychoacousticsWhatIsSoundSoundsarecreatedwhenobjectsvibrateVibrationsofanobjectcausemoleculesintheobjectssurroundingmediumtovibrateandwhichcausespressurechangesinthemediumPhysicalQualitiesofSoundWavesThemagnitudeofdisplacementofasoundpressurewaveperceivedintensityormagnitudeThenumberofsinewavesinagivenwaveformHowwecandistinguishbetweenatromboneandviolinplayingthesamenoteNumberofcyclesthatawavecompletesinagivenamountoftimeMeasuredinCyclespersecondCorrespondstoourperceptionofLowlowHighhighHumanHearingRangeHumanhearingusesalimitedrangeoffrequenciesHzandsoundpressurelevelsdBWehearvibrationsbetweentohertzcyclespersecondHzOuterearSoundsarefirstcollectedfromtheenvironmentbytheSoundwavesarefunneledbytheintotheearcanalThelengthandshapeoftheearcanalenhancescertainsoundfrequenciesThemainpurposeoftheearcanalistoinsulatethestructureatitsendtheTympanicMembraneTheeardrumathinsheetofskinattheendoftheouterearcanalVibratesinresponsetosoundCommonmythPuncturingyoureardrumwillleaveyoudeafInmostcasesitwillhealitselfHoweveritisstillpossibletodamageitbeyondrepairMiddleEarTympanicmembraneisborderbetweenouterandmiddleearConsistsofthreetinybonesandFunctionAmplifyandtransmitsoundstotheinnerearInnerEarFunctionisroughlyanalogoustothatoftheretinaFinechangesinsoundpressurearetranslatedintoneuralsignalsConsistsofcanalsandCochleaisfilledwithwateryfluidsinthreeparallelcanalsOrganofCortiAstructureonthebasilarmembraneofthecochleathatiscomposedofhaircellsanddendritesofauditorynervefibersTwotypesofhaircellshaircellsConveyalmostallinformationaboutsoundwavestothebrainusingafferentfibershaircellsConveyinformationfromthebrainusingefferentfibersElaboratefeedbacksystemHairCellsHairlikeextensionsonthetipsofhaircellsThetipofeachisconnectedtothesideofitsneighborbyatinyfilamentcalledatiplinkPointofjuncture
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