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2M Spearmans rank correlation2006001000140018002200405060708090100Image rank N according to specified groupGroup 1Group 2ChanceAverage memorability according to Group 1of 25 images center ID: 377787
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2M facialcaricatures[26][27].However,acomprehensivestudyofthememorabilityofindividual,naturalphotoshasbeenlacking.Arethephotosrememberedbyonepersonmorelikelytoberememberedalsobysomebodyelse?Inthissection,wecharacterizetheconsistencyofimagememoryacrossdifferentobserversandtimedelays.Inordertodoso,webuiltadatabaseofimages(Figure2),andwemeasuredtheprob-abilityofobserversrememberingeachimage(Figure1shows Spearman!s rank correlation200600100014001800220040%50%60%70%80%90%100%Image rank N, according to specified groupGroup 1Group 2ChanceAverage % memorability, according to Group 1,of 25 images centered about rank NFig.4:Measuresofhumanconsistency.Participantsweresplitintotwoindependentsets,Group1andGroup2.Left:ImageswererankedbymemorabilityscoresfromparticipantsinoneortheothergroupandplottedagainsttheaveragememorabilityscoresgivenbyparticipantsinGroup1.Forclarity,weconvolvedtheresultingplotswithalength-25boxÞlteralongthex-axis.Thegraychancelinewassimulatedbyassigningtheimagesrandomranks(i.e.randomlypermutingthex-axis).Right:SpearmanÕsrankcorrelationbetween Fig.5:Imagememorabilityversusdelaybetweenrepeatandinitialpresentation.Colordepictsmemorabilityrankatshortestdelay.Linesinterpolatebetweenthemeasurementsateachofthethreedelays.SpearmanÕsrankcorrelationsbetweenmemorabilitiesmeasuredateachpairofdelaysaregivenaboveplot.Forclarityofvisualization,eachplottedpointandlineisthemeanmemorabilityof22imagesbinnedintheorderofmemorabilityattheshortestdelay.Wemeasuredthememorabilityofeachimageateachdelay