低事件率效应发生机制的-研究

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1、万方数据AbstractPreviousstudieshaveindicatedthatinthevisualsearchtask，theprobabilityoftargetcouldaffectthesearchingaccuracy．Likelihoodthattargetswillbemissedvarieswithtargetprevalence，thefrequency丽mwhichtargetsarepresentedacrosstrials．Misserrorratesaremuchhigheratlowtargetprevalence(

2、≤10％)thanathighprevalence(≥50％)．Thisphenomenoniscalledlowprevalenceeffect．Therearefourdifferentexplanationsforthisphenomenon：theweighingofspeedandaccuracyaccount，bottom-upprocessingtheory,signaldetectiontheory，two—thresholdaccount．Thisstudy嘶ththreeexperimentsusesexperimentalmater

3、ialsofMelinaA．(2010)．Tobalanceactionandaccuracy，allexperimentsusereactiondetectiontocontrolmotionerror．Thisstudytrytodifferentiatetherestofthethreetheoriesandfindoutthefundamentalreasonoflowprevalenceeffect．Inaddition，experiment3usesevent-relatedpotentialtechnologytoshowthediffer

4、enceofelectricalcomponentsundertheconditionoflowprevalence．Experiment1USeSredandgreenflamehinttodistinguishthetop-downcontrolandbottom-upprocessing，theresultsshowthatundertheconditionofeffectiveframetherestillexistslowprevalenceeffect．Whenthedependentvariableismissingrateandjudgm

5、entstandard，thelowprevalenceeffectissignificant．Soweconcludethatthelowprevalenceeffectisdecidedbythejudgmentcriterion，ratherthanbottom-upprocessing．BasedonthestudyofFanYang,Experiment2trytodistinguishthefundamentalcauseoflowprevalenceeffectinbothhighandlowvisualcomplexityconditio

6、ns，theresuhfollowsup：first，undertheconditionofhighandlowvisualcomplexity,thereislowprevalenceeffect．Second，intheconditionoflowvisualcomplexity,thejudgmentcriterionsinthehi业andlowprevalenceconditionshaven0significantdifference．However,intheconditionofhighvisualcomplexity,thejudgme

7、ntcriterionsinthehighandlowprevalenceconditionshavesignificantdifference．Whenthedependentvariableisreactiontime,inthelowvisualcomplexityandwithouttargetscase，reactioninlowprevalenceconditionissignificantlyshorterthanreactioninhi曲prevalencecondition．Inthehighvisualcomplexityandwit

8、houttargetscase，thesameresultswereobtain