title: Analysis of a case of periodic alternating nystagmus.
abstract: A patient is described in whom there was periodic deviation of the eyes in darkness associated with alternating nystagmus. An exactly similar situation occurs in normal man subjected to a pendular stimulus. It is proposed that in this patient there was alternating activity of the vestibular nuclei on either side of the brain-stem as a result of a removal of cerebellar inhibition, and that this caused periodic shifts in the null region of Daroff and Dell'Osso.
mesh_terms: D000293:Adolescent; D002526:Cerebellar Diseases / Q000150:complications; D005133:Eye Movements; D005260:Female; D006801:Humans; D009759:Nystagmus, Pathologic / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D010507:Periodicity; D014726:Vestibular Nuclei / Q000503:physiopathology*