Alien hand syndrome of the dominant hand and ideomotor apraxia of the nondominant hand.

Following an extended infarction in the territory of the left anterior cerebral artery including the anterior corpus callosum, a 66-year-old right-handed man exhibited an alien hand syndrome on the right side and an ideomotor apraxia of the left hand. In addition to other typical symptoms of frontal lobe lesions, he presented with an interesting difference in the manifestation of perseveration in either hand. In the right hand, the perseveration was part of the alien hand syndrome, whereas in the left hand perseveration showed in the inability to switch promptly from one movement to another on instruction during praxis testing.