**Results Files** These may come as HTML, PDF or a pure JASP file. *2021-09-17* is the original JASP file, with all analyses set up the way they are reported in the body of the manuscript and Table 3. From this JASP file, we exported and uploaded the HTML file of the same name so that viewers without JASP may open the annotated results in their browsers. *2021-05-02* is that same HTML results file updated to exclude those participants whose El Escorial classification was uncertain due to pure upper or lower motor neuron involvement. *2021-05-24* is the results file updated to additionally exclude those participants whose ALS/MND was genetically linked, and it uses the "Mini Strong Criteria" instead of the formal Strong Criteria. The Mini Strong Criteria classify patients als "no cognitive/behavioural impairment", "any cognitive/behavioural impairment without dementia" and "fronto-temporal dementia". We explored these because a reviewer critiqued the small sample size in the ALScbi subgroup.