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The alien hand sign is no joke, but it certainly is bizarre: "failure to recognize ownership of one arm when visual cues are removed, a feeling that one body part is foreign, personification of an arm, and autonomous activity which the patient perceives as outside voluntary control". (Doody R, Jankovic J; Neur 1991;41(suppl 1):122) It is said to be pathognomonic for cortical-basal ganglia degeneration (CBGD), a rare (<1%) relative of PD that is much more severe and has no effective treatment. Cheers, Joe J. R. Bruman (818) 789-3694 3527 Cody Road Sherman Oaks CA 91403