However, visual hallucinations were more common in all three groups (C9orf72 5.4%, GRN 6.5%, MAPT 7.1%) and agitation/aggression (in C9orf72 and GRN), euphoria/elation (in C9orf72 and MAPT), aberrant motor behaviour (in GRN), hypersexuality (in C9orf72) and altered sense of humour (in C9orf72) all occurred more frequently than in controls. This evidence concerns the gene C9orf72 and Hallucinations.