A CASE OF VOLUNTARY NYSTAGMUS AND HEAD TREMOR

A 24-year-old woman presented with nystagmus and head tremor. Both wer e transient and could be executed simultaneously at different frequenc ies of oscillation. It is unusual for these two movements, which can b e voluntary, to occur together. Suspicions of an acquired disease were not confirmed on further investigation using DC-coupled electro-oculo graphy and angular accelerometry, and on an admission by the patient t hat the nystagmus could be voluntary. Voluntary nystagmus can become s emi-automatic and a patient may be able to simulate more than one ''in voluntary movement'' simultaneously yet at different frequencies.