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Selective Visual Dimension Weighting Deficit after Left Lateral Frontopolar Lesions

¹ University of Magdeburg, ² University of Munich, ³ University of Technology, Dresden, ⁴ Research Center Jülich, ⁵ University of Leipzig, ⁶ Max-Planck-Institute for Human Cognitive and Brain Sciences

Reprint requests should be sent to Stefan Pollmann, Institut für Psychologie II, Otto-von-Guericke-Universität, Postfach 4120, D-39016 Magdeburg, Germany, or via e-mail: stefan.pollmann{at}nat.uni-magdeburg.de.

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.