Cancellation task. These are visual search tests, consisting of multiple targets, presented on a sheet of ...HemineglectFromScholarpediaMasudHusain(2008),Scholarpedia,3(2):3681.doi:10.4249/scholarpedia.3681revision#170779[linkto/citethisarticle]Jumpto:navigation,searchPost-publicationactivityCurator:MasudHusainContributors: 0.08-EugeneM.Izhikevich0.06-NickOrbeck0.06-NaotsuguTsuchiya0.03-BenjaminBronnerTobiasDenningerPaoloBartolomeoProf.MasudHusain,UCLInstituteofCognitiveNeuroscienceandInstituteofNeurology,UKFigure1:Drawingofaclockbyapatientwithleft-sidedneglect.Hemineglect,alsoknownasunilateralneglect,hemispatialneglectorspatialneglect,isacommonanddisablingconditionfollowingbraindamageinwhichpatientsfailtobeawareofitemstoonesideofspace.Neglectismostprominentandlong-lastingafterdamagetotherighthemisphereofthehumanbrain,particularlyfollowingastroke.Suchindividualswithright-sidedbraindamageoftenfailtobeawareofobjectstotheirleft,demonstratingneglectofleftwarditems.Thedeficitmaybesoprofoundthatpatientsareunawareoflargeobjects,evenpeople,towardstheirneglectedorcontralesionalside-thesideofspaceoppositebraindamage.Theymayeatfromonlyonesideofaplate,writeononesideofapage,shaveormake-uponlythenon-neglectedoripsilesionalsideoftheirface(samesideasbraindamage).Theirdrawingsmayfailtoincludeitemstowardstheneglectedside,forexamplewhenplacingthenumbersinadrawingofaclock(Fig.1).Manypatientsareoftenalsounawaretheyhaveadeficit(anosognosia).Classically,theneglectsyndromehasbeenassociatedwithdamagetotherightposteriorparietalcortex.Morerecentstudieshavebeguntochallengethisview,suggestinginsteadthatamorewidespreadnetworkofareasmaybeinvolved,includingthosethathavebeenimplicatedinstudiesofneuroimagingofattention(discussedfurtherintheNeuroanatomyofneglectbelow;seealsoCorbetta&Shulman,2002andHusain&Rorden,2003).Differencesinthelocationandextentoflesions(braindamage)acrosspatientsmaycontributetotheheterogeneityofthecondition.Contents1Primarysensoryandmotorrepresentationsmaybeintactinneglect2Agra