Alzheimer’s and related diseases that cause dementia affect half a million Canadians. Canadian actor James Doohan, best known as “Scotty” of the Star Trek television series and movies, was diagnosed with Alzheimer’s disease in 2004. He died in 2005 from complications due to this and other diseases. Although Alzheimer’s impairs crystallized intelligence, it leaves fluid intelligence relatively intact (Matsuda & Saito, 1998).
PARAMOUNT/COURTESY EVERETT COLLECTION