Where would you find a scientific labrotory that is studying alzheimers disease?

A good place to look would be a University Psychology Department (Clinical Psychology) which has a Geriatric (or Aging) Research Centre or Facility. Another place to look would be a Hospital or Health Sciences Centre which has a Geriatric Department (or a Department of Seniors' Health) in which research is often carried out in conjunction with a Medical School. Such a Geriatric Department may be operated as part of, or in conjunction with, a Department of Psychiatry.