ATXN2 and spinocerebellar ataxia type 2: Although the scant catch-up saccades in SCA2 and SCA7 might be caused by spared VOR gains for the HCs, saccadic generator dysfunction might also contribute to the paucity of catch-up saccades as well as scant GEN, considering that horizontal saccadic slowing is a cardinal ocular motor sign in SCA2 and SCA7, as replicated by our study.