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Brain, Vol. 126, No. 4, 908-919, April 2003
© 2003 Guarantors of Brain
doi: 10.1093/brain/awg075

Pure agnosia for mirror stimuli after right inferior parietal lesion

Konstantinos Priftis1,2, Elena Rusconi1, Carlo Umiltà1 and Marco Zorzi1

1 University of Padova, Padova and 2 University of Trieste, Trieste, Italy

Correspondence to: Professor Marco Zorzi, Dipartimento di Psicologia Generale, via Venezia 8, 35131, Padova, Italy E-mail: marco.zorzi{at}unipd.it

This study reports the experimental investigation of G.R., a patient suffering from a highly specific disorder in discriminating mirror stimuli following a right temporoparietal cerebrovascular accident. G.R. showed intact perceptual, attentional, mnestic, linguistic and executive abilities. Object recognition was accurate even under unusual viewing conditions. He was highly accurate in defining the canonical orientation of common objects and in discriminating misoriented objects among identical distracters. However, he was severely impaired in tasks requiring mirror-stimulus discrimination, a deficit that persisted even when the object’s coordinates were systematically misaligned with respect to his body. The disorder was also dependent upon the frame of reference (allocentric versus egocentric) activated on the basis of task demands. These results demonstrate the existence of a highly specific disorder in discriminating mirror stimuli defined in object-based coordinates, suggesting a failure in processing the directionality of an object’s intrinsic x-axis.


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