GLRA1 and movement disorder: Reports on the occurrence of psychogenic movement disorders in the context of a positive family history of hyperkinesias are scarce.4 HPX is responsive to clonazepam, and the Vigevano maneuver is effective during the neonatal period.3 HPX associated with GLRA1 mutations is in most cases an autosomal recessive disease.2,3 Hypnagogic myoclonus and umbilical hernia have been described in association with GLRA1 mutations.