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Midterm

Perception Midterm 1.docx

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Department
Psychology
Course
PSYC 212
Professor
Evan Balaban
Semester
Fall

Description
 Initialintensitywouldbe set above orbelow thresholdlevel,andthesubjectwould adjusttheleveluntilthestimulusjustdisappearsor isjustperceptible  Fast o Method of Limits:Human subjectispresentedwithastimuluswhose intensityischosen froman ascending or descending series  Ascending series: The stimulusisinitiallysetatasubthresholdlevel,andincreases byafixedamountuntilthesubjectreportsthat itisperceived  Descending series:The stimulusisinitiallysetatasuprathresholdlevel,and decreasesbyafixedamountuntilthesubjectreportsthat ithasdisappeared  Morereliable thanadjustment o Method of Adjustment andMethod of Limitsallow the subjecttohave an ideaofwhat thenext stimuluswillbe comparedtothelastone.  Not accurate methods o Method of Constant Stimuli:Human subjectispresentedwithintensityvaluesthatare randomlyselectedfromapresetrange.  The subjectreplieswhether ofnotthesensation occurred(Yes/No)  Mostreliable ofallthree 2. Absolute Threshold  Iftheresponsecurve lookslikeastep function,we presumethat the subjectbehaveslikean ideal detector=perfectin distinguishing between these twoconditions o Allintensitiesbelowacertain point(subthreshold)wouldbe toolow todetect, resulting in a responseofNO o Allintensitiesabove acertain point(suprathreshold)wouldbe enough totrigger sensation, resulting in aresponseofYES o The transition statebetween these tworesponselevelsiswhat’sknown astheabsolute threshold  Graphof%ofYES responsesvs.StimulusIntensity o Asthestimulusintensityincreases,thepercentage ofYES responsesincreasesintheform ofastep function Humans are not ideal detectors  Iftheresponsecurve lookslikean ogive function, orpsychometric function(S-shaped),we presumethat the subjectisnotan idealdetector.
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