<prompt> All of the following shows positive myoclonus except?Hepatic encephalopathyVariant CJDJanz syndromeSalaam seizures  <response>: Negative myoclonus: Metabolic cause which contributes to development of myoclonus. E.g. Metabolic encephalopathies Variant CJD- stale reflex myoclonus variant loud noise causes a myoclonus Janz syndrome- Juvenile myoclonic epilepsy Hypnogogic jerks: Falling to sleep and sudden jerky movement e.g. while going off to sleep 