“…In addition to the cognitive deficits, behavioural symptoms, such as aggression and apathy or lack of initiative, have been noticed from the earliest reports of the disease and have also been mentioned in some more recent studies amongst KS patients (Blansjaar et al, 1987;Egger et al, 2002;Gerridzen and Goossensen, 2014;Ridley et al, 2013;Thomson et al, 2012;Victor et al, 1989). Sergei S. Korsakoff, a Russian physician who was the first to describe KS, observed that in some KS cases, the predominant features were increased irritability and agitation (Victor and Yakovlev, 1955).…”