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实验心理学实验报告信号检测论evalutemethod
ExperimentReport
Name:
曾翘楚Major:
PsychologyNo:
2012213970Reporttime:
4.28
Signaldetectiontheory–evaluatemethod
1.Introduction
1.1Experimentobjective
Learnthesignaldetectiontheoryandevaluatemethodwhichisoneofitsbasicprocessesbyrecognizepicture.
1.2Experimentcontent
Signaldetectiontheoryisanimportantbranchofinformationtheory.Itcanmeasurenotonlypeople’sreactionofsignalstimulate,butalsonoisesimulate.Thus,itcandistinguishsensitivityfromcriterionofjudgmentandexpressthemindifferentdata.
1.3Experimentmeaning
AmericanpsychologistsW.P.TannerandJ.A.Swetsusesignaldetectiontheoryintheprocedureofhuman’sperceptionwhichledpsychologicalphysicstoanewperiod.Evaluatemethodisabasicexperimentprocess.Forevaluatemethod,participantsarerequiredtodeterminewhetherthereissignalornot,atthesametime,theyhavetoevaluatetheirchoiceaccordingtoacertainclass,thatishowmuchdegreearetheysureabouttheirdecision.
Comparedwiththeothermethodofsignaldetectiontheory,usingevaluatemethodcanobtainmoreinformationofparticipantatthesametime.Wecangetmorethantwocriteria,andinthatcase,wecandrawROClinesafteroneexperiment.
2.Method
2.1Subject
4collegestudentsofpsychologydepartmentinCentralChinaNormalUniversityattheageof19to21.Allparticipantsarenormalintelligenceandmemory.Twostudentsamongthemarefemale.
2.2Equipmentormaterial
Twosetsofpicturesandonesetincludes60differentpictureswhichisusedassignal;theothersetincludes60differentpictureswhichissimilartothefirstsetisusedasnoise.Psykeyprocedure.Keyboardsandcomputers.
2.3Design
Thisiswith-insubjectdesign.Participantsarerequiredtojudgethepicturedisplayedonscreenhadbeenrememberbeforeandthenevaluatetheconvincedegree.
2.4Procedure
1.Theinstructionofexperimentwillshowonthescreen.
2.Intheprocessofremember,60signalswillbedisplayedrandomlyonebyone,andparticipantsneedtorememberthesepicturesascorrectaspossible.
3.Afterthat,wewillenterintotheprocessofjudgment.Inthispart,bothsignalsandnoisewillbemixedanddisplayedrandomlyonebyone.Participantsareaskedtojudgethatwhetherthepictureissignalornotandhowmuchdegreedotheycertain.
4.1represents0%surewhichmeanstotallysureaboutthattheyhaven’tseenthepicture.2means25%sure;3means50%sure;4means75%sureand5representstheytotallysurethattheyhaveseenthepicture.Aftermakingadecision,theyshouldpressthecorrespondingnumberingkey.
5.Leadparticipantsreadtheinstructionandmakesurethattheyunderstandtherequirementsoftheexperimentandcorrectwaytooperatethecomputers.
6.Computerswillrecordthereactionofparticipants.
7.Collectdataandanalyzeit.
3.Results
3.1originaltable
Participant1：
1
2
3
4
5
Total
SN
N
6
50
0
5
1
1
4
2
49
2
60
60
Participant2:
1
2
3
4
5
Total
SN
N
3
37
4
11
2
6
6
0
45
6
60
60
Participant3:
1
2
3
4
5
Total
SN
N
6
55
7
2
0
1
3
2
44
0
60
60
Tablesabovedescribedthereactionofeachparticipantinexperiment.
3.1sortedtable-thenumberofsignalofnoisejudgedbyparticipantunderdifferentconfidencedegree
Participant1:
1+2+3+4+5
2+3+4+5
3+4+5
4+5
5
SN
N
60
60
54
10
54
5
53
4
49
2
participant2:
1+2+3+4+5
2+3+4+5
3+4+5
4+5
5
SN
N
60
60
57
23
53
12
51
6
45
6
Participant3:
1+2+3+4+5
2+3+4+5
3+4+5
4+5
5
SN
N
60
60
54
5
47
3
47
2
44
0
Tablesabovecountedthetotalreactionsofeachparticipantunderdifferentinternals.
3.2participants’judgmenttostimulateunderfourcertainlevels
Participant1:
C1
C2
C3
C4
hit
false
0.82
0.03
0.88
0.07
0.9
0.17
0.9
0.17
participant2:
C1
C2
C3
C4
hit
false
0.75
0.1
0.85
0.1
0.88
0.2
0.95
0.38
Participant3
C1
C2
C3
C4
hit
false
0.73
0
0.78
0.03
0.78
0.05
0.9
0.08
Evenundertheforthcriteria,thefalsereactionisverylowwhichisonly0.08.Itsuggeststhatthecriterionofthirdparticipantishigh.Highercriterionleadshimorhertomoredifficulttomake“yes”decision.Inthatcase,heorshehasfewerfalserateswhilehaslowerhitrateeither.
3.3ANOVA
participant
SS
Meansquare
df
D’
β
F
Sig.
1
438.325
297.675
119
249.738
.000
2
421.967
276.033
119
223.197
.000
3
383.592
205.408
119
136.029
.000
Comparethesethreeparticipants’reaction,wecaninformthatallp=.000<.05,whichmeansthreeparticipantsaredifferentfromeachothersignificantly.
3.5ROCCurve
AccordingtotheROCCurveabove,wecanknowthateventhoughthreeROCCurveisseparatetoeachotherwhilethetendencyofROCCurveissimilartoeachother.
Thisisthefirstparticipant’sROCCurve,andwecanseethatthelineisfarfromupper-leftpoint,whichmeanshisorhersensibilityisnotverygood,whilethisphenomenonisuncommon.
Thisisthesecondparticipant’sROCCurve,andwecaninformthathisorhersensibilityisbetterthanthefirstonewhichisontheusuallevel.
Thisisthethirdparticipant’sROCCurve,andIfinditquitedifferentfromothers.Iusedthesamewaytodealwithdataanddrawthepicture,whileIgotdifferentresult.Ihavenoideaaboutit.
Itriedanotherwaytodrawthesepicture,andIgotthis.
AccordingtotheROCCurveabove,wecanknowthateventhoughthreeROCCurveisseparatetoeachotherwhilethetendencyofROCCurveissimilartoeachother.
4.Discussion
4.1Discussingeneral.
Accordingtoallpicturesabove,wecaneasilyfindthatlinesaresmoothandgentle.ROCCurve’sslopeisshiftingdown.Withthedecreasingofcriteria,falserateofparticipantsincreasesignificantly.
4.2Othereffect.
Therealresultisdifferentfromtheory.Maybethatduetosomeextraneousvariablesaremakingdifference,suchasthepositionparticipantwereorlastingtimeandwayofstimulatedisplayed,evenenvironmentaroundparticipantsandemotionwouldhaveaneffectonresult.
4.3Differencebetweenparticipants
Wecaneasilyinformthatdifferentparticipanthasdifferentsensibility.Participants’owncriterionsmaybethemainreasonwhythishappen.Highercriterialeadtolowerhitrateandfalserateandinreverse.
4.5comparedwithothermethod
Comparedwiththeothermethodofsignaldetectiontheory,usingevaluatemethodcanobtainmoreinformationofparticipantatthesametime.Wecangetmorethantwocriteria,andinthatcase,wecandrawROClinesafteroneexperiment.
5.Conclusion
Signaldetectiontheory–evaluatemethodisausefulwaytomeasuresensibilityanddistinguishsensibilityfromthreshod.
6.Reference
BomingYang,心理实验纲要，P42-61
7.Appendix（可将原始数据单附于页面后）
＝＝＝＝＝结果分数＝＝＝＝＝
----------------------------------
类型 １ ２ ３ ４ ５ 合计
----------------------------------
信号 6 0 1 4 49 60
噪音 50 5 1 2 2 60
----------------------------------
＝＝＝＝＝备 注＝＝＝＝＝
测验耗时：
691秒
[参数表]
图片评价时间（毫秒）=5000
图片呈现时间（毫秒）=2000
图片间隔时间（毫秒）=1000
＝＝＝＝＝详细反应＝＝＝＝＝
图片名称类型判断
噪音1
噪音1
噪音2
信号5
噪音1
噪音1
信号5
信号5
噪音1
噪音1
信号5
信号5
噪音1
信号5
噪音1
噪音1
噪音2
噪音1
信号5
噪音1
信号1
噪音1
信号5
信号5
噪音1
噪音1
信号5
噪音1
噪音1
噪音1
噪音1
噪音1
信号5
噪音1
信号5
信号4
噪音1
信号5
信号5
噪音1
噪音1
噪音1
噪音5
信号5
噪音1
信号5
信号5
信号1
噪音1
噪音1
噪音1
噪音1
信号1
信号5
信号5
噪音1
噪音2
信号5
信号5
信号5
信号4
信号5
噪音1
噪音1
信号5
信号4
信号5
信号5
信号5
噪音1
噪音1
噪音1
信号5
信号5
信号4
噪音1
噪音1
噪音2
噪音1
信号5
噪音1
信号5
信号1
信号5
信号5
信号5
噪音1
噪音1
信号5
噪音1
信号5
噪音4
噪音1
信号5
信号1
噪音1
信号5
信号5
噪音3
信号5
噪音5
信号5
噪音1
噪音2
噪音1
信号5
信号5
信号5
噪音4
信号5
噪音1
噪音1
信号3
信号5
噪音1
信号1
信号5
信号5
信号5
噪音1
＝＝＝＝＝结果分数＝＝＝＝＝（男）
----------------------------------
类型 １ ２ ３ ４ ５ 合计
----------------------------------
信号 3 4 2 6 45 60
噪音 37 11 6 0 6 60
----------------------------------
＝＝＝＝＝备 注＝＝＝＝＝
测验耗时：
593秒
[参数表]
图片评价时间（毫秒）=5000
图片呈现时间（毫秒）=2000
图片间隔时间（毫秒）=1000
＝＝＝＝＝详细反应＝＝＝＝＝
图片名称类型判断
信号5
噪音1
噪音2
噪音1
信号5
信号5
噪音1
信号5
噪音1
噪音1
信号5
噪音3
噪音1
噪音5
信号5
噪音5
信号5
噪音5
信号5
噪音1
信号5
噪音2
噪音1
噪音1
噪音5
信号5
信号5
信号5
信号5
信号5
信号5
信号5
噪音2
信号1
噪音1
信号5
噪音1
信号4
信号4
信号3
噪音5
噪音1
信号5
信号4
信号4
信号5
噪音2
信号5
信号2
噪音1
信号5
噪音2
信号5
信号5
噪音1
信号5
噪音3
噪音2
信号1
信号5
噪音2
信号5
噪音5
信号5
信号4
噪音2
噪音1
噪音1
信号5
噪音2
噪音1
噪音1
噪音1
信号5
信号2
信号5
噪音2
噪音1
信号5
噪音3
信号1
信号3
噪音3
噪音1
信号2
信号5
噪音2
信号2
噪音1
噪音1
信号5
信号5
噪音1
信号4
信号5
噪音1
噪音1
噪音1
信号5
信号5
噪音1
信号5
噪音1
噪音1
信号5
噪音1
信号5
信号5
噪音1
噪音1
信号5
信号5
信号5
噪音3
噪音1
噪音1
噪音3
噪音1
噪音1
信号5
＝＝＝＝＝结果分数＝＝＝＝＝
----------------------------------
类型 １ ２ ３ ４ ５ 合计
----------------------------------
信号 6 7 0 3 44 60
噪音 55 2 1 2 0 60
----------------------------------
＝＝＝＝＝备 注＝＝＝＝＝
测验耗时：
656秒
[参数表]
图片评价时间（毫秒）=5000
图片呈现时间（毫秒）=2000
图片间隔时间（毫秒）=1000
＝＝＝＝＝详细反应＝＝＝＝＝
图片名称类型判断
信号5
噪音1
信号5
噪音1
噪音1
噪音1
噪音4
信号2
噪音1
噪音1
信号5
噪音1
噪音1
信号5
噪音4
噪音1
噪音3
信号5
噪音1
噪音1
噪音1
信号5
信号2
信号5
信号5
噪音1
信号2
信号5
信号5
信号5
信号5
噪音1
信号5
噪音1
噪音1
噪音1
噪音1
信号5
信号1
噪音1
噪音1
信号5
信号5
信号1
噪音1
噪音1
信号1
信号5
信号1
信号4
信号5
信号5
信号4
信号5
噪音1
信号5
噪音1
噪音1
噪音1
信号5
噪音1
噪音1
噪音1
信号5
噪音1
噪音1
信号5
噪音1
噪音1
信号
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