نبذة مختصرة : Whether cognitive and behavioural impairment in amyotrophic lateral sclerosis (ALS) is progressive is unknown. The majority of longitudinal studies (summarised in online supplementary material) are characterised by stable test results, high attrition and under-representation of patients with a short disease duration.1 2 The aim of this study was to determine progression of cognitive and behavioural impairment in patients with early symptomatic ALS. ### Supplementary data [jnnp-2020-322992supp001.pdf] At our tertiary ALS clinics, we consecutively recruited patients with ALS with a short disease duration (3 abnormal tests (including letter fluency, and either two executive or two language tests, as described above).3 We used the ALS-FTD-Questionnaire (ALS-FTD-Q) to subdivide patients into groups with ‘no’ (
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