Park et al. also described two cases of infarction as the origin of alien hand symptoms. Both individuals had suffered an infarction of the anterior cerebral artery (ACA). One individual, a 72 year-old male, had difficulty controlling his hands, as they often moved involuntarily, despite his trying to stabilize them. Furthermore, he often could not let go of objects after grasping them with his palms. The other individual, a 47 year-old female who suffered an ACA in a different location of the artery, complained that her left hand would move on its own and she could not control its movements. Her left hand could also sense when her right hand was holding an object and would involuntarily, forcibly take the object out of her right hand.