Teuni Ten Brink investigated the organization of target cancellation in a shape cancellation task. She showed that stroke patients with neglect searched less organized than patients without neglect.
Ten Brink, T., Van der Stigchel, S., Visser-Meily, A., & Nijboer, T.C.W. (in press). You never know where you are going until you know where you have been: disorganized search after stroke. Journal of Neuropsychology.