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Title of Journal: Exp Brain Res

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Abbravation: Experimental Brain Research

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Springer-Verlag

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DOI

10.1002/andp.19063251009

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1432-1106

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Mirror apraxia affects the peripersonal mirror spa

Authors: Ferdinand Binkofski Andrew Butler Giovanni Buccino Wolfgang Heide Gereon Fink HansJoachim Freund Rüdiger J Seitz
Publish Date: 2003/09/09
Volume: 153, Issue: 2, Pages: 210-219
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Abstract

Mirror apraxia is a condition in which patients with lesions of the posterior parietal cortex have deficits in reaching to objects presented through a mirror The aim of the present study was to investigate possible mechanisms underlying this disorder First we addressed the question of whether mirror apraxia is exhibited to the same extent in peripersonal and in body space Four patients with lesions of the posterior parietal lobe on either side and with marked mirror apraxia were required to reach for objects that were presented to them through a mirror and located either in body space ie on the body surface or in peripersonal space ie in the reaching distance Whereas reaching for objects located in body space was flawless in all patients the performance deteriorated when the same objects were transferred to the peripersonal space Although the objects were located only a few centimetres above the body surface the patients reached towards the virtual object in the mirror Based on these results we suggest that mirror apraxia may originate from a dissociation between the representations of body schema and peripersonal space and that objects located on the body surface become integrated into the body schema In the second part of the study using positron emission tomography study PET we studied the cerebral activation pattern during reaching to objects presented through a mirror in the peripersonal space in healthy subjects The results show that increased neural activity in the anterior part of the intraparietal sulcus and in the dorsal premotor cortex was bound to the transformation of the target position from the mirror space to the real space In contrast the activity related to object localization in the mirror occurred at the parietooccipital junction Both mirror and arm transformation involved the medial posterior part of the superior parietal lobule putatively area V6a The results demonstrate that acting through a mirror is processed in a number of cortical areas of the dorsal stream

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