Microsoft Corporation
On a cold, wet afternoon not long ago, Aron Reznick sat in the lounge of a home for the elderly here, his silver hair neatly combed, his memory a fog. He could not remember Thanksgiving dinner with his family, though when he was given a hint—“turkey”—it came back to him, vaguely, like a shadow in the moonlight.
Two years ago, Mr. Reznick, who has early-stage Alzheimer’s disease and is now 82, signed up for an experiment intended to help people with Alz...