Abstract
The Money Road-Map Test (MRMT) is a paper and pencil assessment of left-right discrimination. Some of the answers require an egocentric mental rotation in space. In a first experiment with 63 normal adults, we found that the accuracy and speed of the left-right decision process significantly decreased with a increasing degree of mental rotation required. A division of the MRMT turns in three categories with increasing mental rotation was proposed. In a second study (n = 50), patients with predominantly parietal brain lesions performed significantly worse than patients with predominantly frontal lesions. The significant group difference in total error score was especially due to the error scores of turns requiring mental rotation. The turn type analysis did not contribute to the lateralization of the lesions.
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