The left lateral frontopolar (LFP) cortex showed dimension change-related activation in previous event-related functional magnetic resonance imaging studies of visual singleton feature search with non-brain-lesioned participants. Here, we tested the hypothesis that LFP actively supports changes of attention from the old to the new target-defining dimension in singleton feature search. Singleton detection was selectively slowed in this task when the target-defining dimension changed in patients with left LFP lesions, compared with patients with frontomedian lesions as well as with matched controls without brain lesions. We discuss a potential role of LFP in change detection when the optimal allocation of dimension-based attention is not clearly defined by the task.
['Stefan Pollmann', 'Katharina Mahn', 'Brit Reimann', 'Ralph Weidner', 'Marc Tittgemeyer', 'C. Preul', 'H. Müller', 'D.Y. von Cramon']
Selective Visual Dimension Weighting Deficit after Left Lateral Frontopolar Lesions