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ORIGINAL PAPER Impaired Imagery for Upper Limbs

By Leila S. Overney, Æ Olaf Blanke, L. S. Overney and O. BlankeL. S. Overney, L. S. Overney and O. Blanke


Abstract The brain processes associated with mental imagery have long been a matter of debate. Neuroimaging and neuropsychological studies have yielded diverging evidence of mental transformation activating the right hemisphere, the left hemisphere, or both. Here, using a mirror/normal discrimination task with rotated body parts (BPs) and external objects (EOs), we describe the case of a patient who developed a selective deficit in mental imagery of such BPs due to left posterior parietal brain damage. In addition, the patient’s deficit predominated for pictures of right arms (i.e., arms corresponding to the patient’s imagined contralesional arm) and was further characterised by an inability to distinguish between anatomically possible and impossible arm positions. This neuropsychological deficit was corroborated by neuroimaging evidence revealing the absence of activation in the left parietal lobe for the mental rotation of body parts as shown in healthy participants. In contrast, his behavioural performance and brain activation for EOs were similar to those of healthy participants. Thes

Year: 2008
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