Embodiment of an alien hand interferes with intact-hand movements

Embodiment of an alien hand interferes with intact-hand movements

Figure 1. Ovalization results for the patients and controls. Bar plots show the Ovalization Index mean values (with standard error) for each group — controls (C), E– and E+ patients — in each condition. Different lines show the individual mean values for each E+ patient (as single case) in each condition. * P < 0.01; ** P < 0.001. The two boxes at the top of the figure show examples of right ha...

Alien hand sign or alien hand syndrome?

The alien hand syndrome: What makes the alien hand alien?

The alien hand syndrome is a deeply puzzling phenomenon in which brain-damaged patients experience their limb performing seemingly purposeful acts without their intention. Furthermore, the limb may interfere with the actions of their normal limb. We report a case of alien hand syndrome following a left medial frontal and corpus callosum ischemic lesion. From our clinical observations and the pa...

Alien Hand Syndrome: Neural Correlates of Movements without Conscious Will

BACKGROUND The alien hand syndrome is a striking phenomenon characterized by purposeful and autonomous movements that are not voluntarily initiated. This study aimed to examine neural correlates of this rare neurological disorder in a patient with corticobasal degeneration and alien hand syndrome of the left hand. METHODOLOGY/PRINCIPAL FINDINGS We employed functional magnetic resonance imagin...

Paroxysmal alien hand syndrome.

Four patients are described who presented with a paroxysmal form of the alien hand syndrome. Two patients with damage to one frontomedial cortex had brief episodes of abnormal motor behaviour of the contralateral arm that featured groping, grasping, and apparently purposeful but perseverative movements, which both patients interpreted as alien or foreign. The other two patients, with posterior ...