Mrs A and Mrs B are both in their late 70s. Their families share similar stories: a few months ago, they both started to talk to famous people from the front pages of magazines laid nearby their chairs and consider them their co-tenants. Cognitive assessment showed that Mrs A's cognitive functions are well preserved. In contrast, Mrs B's examination revealed moderate to strong cognitive deterioration. Her abilities to perceive, register, store, retrieve, and use information are impaired. Sometimes she does not recognize her granddaughters.