Lecture 9_NPB_101

Lecture 9_NPB_101 - Lecture9 OnlineHandouts: Lec9Notes...

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Unformatted text preview: Lecture9 OnlineHandouts: Lec9Notes Announcements: Ifyouhavenotbeenadded totheclassbynext Mondayletmeknow. ReviewSensorySystems Somatosensorysystem TheEar Auditorysystem Reading(Recommended): Ch6(pg.185188) Ch6(pg.208220) REV:Receptors AfferentarmofPNS ReceptorstransducesensorysUmuli ClassifiedbytypeorlocaUonofsUmuli TransducUonsUmulusenergytoEmchange Receptorcellvs.Receptorneuron ReceptoradaptaUon Tonic=sUmuluslevel Phasic=sUmuluschange SomatosensorySystem RecepUveField Fig.66,pg.187 LateralInhibiUon Skin surface Receptor pathways Severalreceptorsrespond toasUmulus,whileothers donot LateralinhibiUonincreases contrastbetween responsiveversusthe unsUmulatedreceptors Stimulated less Stimulated less Stimulated most Frequency of action potentials Baseline level of activity Location on skin Fig.67a,pg.187 LateralInhibiUon Skin surface Lateral inhibition Transmission stopped Transmission stopped Receptor pathways Stimulated less Stimulated less Transmission continues Stimulated most Frequency of action potentials Baseline level of activity Frequency of action potentials Baseline level of activity Location on skin Fig.67,pg.187 Area of sensation on skin LabeledLineCoding ModalityortypeofinformaUon TheSomatosensoryCortex Front Left hemisphere Right hemisphere Frontal lobe Central sulcus Primary motor cortex Top view Parietal lobe Somatosensory cortex Occipital lobe Back Fig.510a,pg.145 SensoryHomunculus Somebodyregions havegreater representaUon Morecortexdevoted toprocessingsUmuli fromthatregion Fig.510b,pg.145 IntegraUonofSensoryInformaUon 1. ModalityortypeofsensoryinformaUon 2. Receptortype 3. APfiringrateofafferentproporUonalto sUmulusintensity 4. RateofreceptoradaptaUon 5. Numberofafferentsfiring 6. Receptordensity/Receptorfieldsize 7. LateralinhibiUon 8. Labeledlinecoding TheEar (Auditory&VesUbular) Ear Consistsofthreeparts Externalear Consistsofpinna,externalauditorymeatus,andtympanum Transmitsairbornesoundwavestofluidfilledinnerear Amplifiessoundenergy Transmitsairbornesoundwavestofluidfilledinnerear Amplifiessoundenergy Middleear Innerear Housestwodifferentsensorysystems Cochlea Containsreceptorsforconversionofsoundwavesintonerveimpulseswhich makeshearingpossible VesUbularapparatus ContainsreceptorsforconversionofacceleraUonintonerveimpulseswhichis importantforsenseofequilibrium EarAuditory Fig.630,pg.210 AudiUonHearing Whatistheauditorysystem? NeuralpercepUonofsoundenergy IdenUficaUonofthesounds("what") LocalizaUonofthesounds("where") Soundwaves TravelingvibraUonsofair ConsistofalternateregionsofcompressionandrarefacUonofair molecules Brokendowntofrequencyandamplitudecomponentsbythe receptorsoftheinnerear InformaUonisprocessedinthebrainbyresynthesizingthe frequency&amplitudecomponentsconveyedbythe receptorgeneratedAPs FormaUonofSoundWaves Fig.631,pg.210 ProperUesofSoundWaves Fig.632,pg.211 SoundWaveTransmission Tympanicmembranevibrateswhenstruckbysoundwaves MiddleeartransfersvibraUonsthroughossicles(malleus, incus,stapes)toovalwindow(entranceintofluidfilled cochlea) Pressurewavesincochlearfluidsetbasilarmembranein moUon RecepUvehaircellsarebentasbasilarmembraneis deflectedupanddown MechanicaldeformaUonofspecifichaircellsistransduced intoneuralsignalsthataretransmigedtoauditorycortexin temporallobeofbrainforsoundpercepUon SoundWaveTransmission Fig.634a,pg.214 TransmissionofSoundWaves Fig.634bc,pg.214 ...
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