Alien hand phenomena: A review with the addition of six personal cases

This is a comprehensive literature review of the motor abnormalities that h ave come to be included under the designation of Alien Hand Phenomena (AHP) . Some of the disorders are dyspractic in nature - intermanual conflict, mi rror movements, interference etc., while others - groping, grasping with in ability to release, utilization etc, are frontal lobe reflexes. AHP are mai nly associated with two pathological processes: if Infarction or hemorrhage in the territory of the anterior cerebral arteries; and 2) Corticobasal de generation. included in the review is a description of AHP in six personal cases of corticobasal degeneration. The summary includes a short discussion of the possible anatomy of 'free will' based on AHP.