tokens: We compared horizontal eye movements ( visually guided saccades , antisaccades , and smooth pursuit ) in control subjects ( n = 14 ) and patients with three forms of autosomal dominant cerebellar ataxias type I spinocerebellar ataxias 1 and 2 ( SCA1 , n = 11 ; SCA2 , n = 10 ) and SCA3 / Machado - Joseph disease ( MJD ) ( n = 16 ) .