Abstract
A team of professionals considers whether a patient in her early 50s is developing Alzheimer’s. The patient is not experiencing the memory symptoms typical of that disease, with so far a few years of sporadic attentional lapses as the predominant cognitive complaint. Her most dramatic symptom is her impression that two versions of her husband live with her. One is her real husband, the other a “fake.” There is no elaborated story about who the fake is or why he is there, and there is little in the way of behavior consistent with the idea. To the patient, there is a vague sense that her husband doesn’t belong in the house, but no clearly articulated...