That difference is "unexpected but not inexplicable, " says Zaven Khachaturian, president of Keep Memory Alive in Las Vegas and former head of Alzheimer's research at the National Institutes of Health.

FORBES: Magazine Article

Proponents of the amyloid theory "listen to each other and reinforce each other, and after a while it becomes more of a religious belief, " says Zaven Khachaturian, former head of Alzheimer's research at the National Institutes of Health.

FORBES: Attacking Alzheimer's

But now "we are at a historic point where some new ideas are being able to question the orthodoxy of the amyloid hypothesis, " says Zaven Khachaturian, president of Keep Memory Alive in Las Vegas and former head of Alzheimer's research at the National Institutes of Health.

FORBES: Alzheimer's Drug Showdown