Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Spinocerebellar ataxia 3 ?
    ### Response:
    Spinocerebellar ataxia 3 is a rare movement disorder that is characterized by ataxia, clumsiness and weakness in the arms and legs, spasticity, a staggering lurching walk easily mistaken for drunkenness, difficulty with speech and swallowing, and involuntary eye movements sometimes accompanied by double vision, and bulging eyes.
    