Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Opsoclonus Myoclonus ?
    ### Response:
    Opsoclonus myoclonus is a rare neurological disorder characterized by an unsteady, trembling gait, myoclonus (brief, shock-like muscle spasms), and opsoclonus (irregular, rapid eye movements). Other symptoms may include difficulty speaking, poorly articulated speech, or an inability to speak.
    