Figure 2

VEP quality is decreased in ALS, particularly in the presence of C9ORF72 expansion. Top: Mean quality of the evoked potential (±SEM) for controls and patients, with and without the expansion. Bottom: Windows where there exist significant differences in VEP quality between the three groups as well as three post-hoc pairwise comparisons. These differences are shown a the α = 0.05 level (light colors) as well as after FDR correction (dark colors).