The structural connectivity (SC) alterations in language‐associated white matter tracts. Asterisks represent different levels of significance: +p
adj ≤ .05; *p
adj ≤ .01; and **p
adj ≤ .001. Box plots indicate medians and upper/lower quartiles, as well as outliers as dots. adj, adjusted; AF, arcuate fascicle ALS, amyotrophic lateral sclerosis; ALSFTDC9–(+), (non)carriers of the repeat expansion in the C9orf72 gene; ALSnci, noncognitively impaired ALS; ANOVA, analysis of variance; bvFTD, behavioral variant FTD; FA, fractional anisotropy; FTD, frontotemporal dementia; IFO, inferior occipitofrontal fascicle; ILF, inferior longitudinal fascicle; HC, healthy control; HSD, honest significant difference; nfvPPA, nonfluent variant PPA; PPA, primary progressive aphasia; RD, radial diffusivity; ROI, region of interest; SC, structural connectivity; SLF, superior longitudinal fascicle; svPPA, semantic variant PPA; UF, uncinate fascicle.