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Chapter Sensation and Perception | Vision

IAT 201 Chapter Sensation and Perception | Vision : IAT 201 - Week 2 Noba Readings


Department
Interactive Arts & Tech
Course Code
IAT 201
Professor
Brian Fisher
Chapter
Sensation and Perception | Vision

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Week2:SensationandPerception|Vision
Saturday,September23,2017 12:01PM
SensationandPerception
• Oursensesconvertreal‑worldinfointoelectricalinfothatcanbeprocessedby
thebrain
• Howweinterpretthisinfo‑ourperceptions‑iswhatleadstoourexperiences
oftheworld
Sensation:thephysicalprocessduringwhichoursensoryorgans‑involvedwith
hearingandtaste‑respondtoexternalstimuli
○ Occurswhenyoueatnoodlesorfeelthewindonyourface
• Duringsensationoursenseorgansareengagingintransduction(the
conversionofoneformofenergyintoanother)
Perception:apsychologicalprocess‑makingsenseofthestimuli‑
Physicalenergysuchaslightorsoundwaveisconvertedintoaformofenergy
thebraincanunderstand:electricalsimulation.Onceourbrainreceivesthe
electricalsignalswemakesenseofallthisstimulationandbegintoappreciate
thecomplexworldaroundus
○ duringthisprocessyouareabletoidentifyagasleakinyourhomeora
songthatremindsyouofaspecificevent
• Eachsenseorgan(ie.Eyes,tongue)requiresaminimalamountofstimulation
inordertodetectastimulusanAbsolutethreshold
Signaldetection:measuringabsolutethresholdsbypresentingstimuliof
varyingintensitiestoaresearchparticipantinordertodeterminethelevelat
whichtheycanreliablydetectstimulationinagivensense
Differentialthresholdorjustnoticeabledifference(JND):thesmallest
differenceneededtodifferentiate2stimuli
Weber'sLaw:biggerstimulirequirelargerdifferencestobenoticed
Bottom‑upprocessing:whenwebuilduptoperceptionfromtheindividual
pieces
Top‑downprocessing:stimuliwe'veexperiencedinourpastwillinfluencehow
weprocessnewones
• Whenweexperienceasensorystimulusthatdoesn'tchange,westoppaying
attentiontoit
Sensoryadaptation:whenastimulusisconstantandunchanging
Vision
HowVisionWorks
• Whenweseeanobject,weareactuallyseeinglightbounceoffthatobjectand
intooureye
• Lightenterstheeyethroughthepupil,atinyopeningbehindthecornea
• Thepupilregulatestheamountoflightenteringtheeyebycontracting
(gettingsmaller)inbrightlightanddilating(gettinglarger)indimmerlight
• Oncepastthepupil,lightpassesthroughthelens,whichfocusesanimageona
thinlayerofcellsinthebackoftheeye,theretina
• Becausewehave2eyesindifferentlocations,theimagefocusedoneach
retinaisfromaslightlydifferentangle(binoculardisparity),providinguswith
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