(pronounced Allz-high-merz duh-zeez)
A disease that causes large numbers of nerve cells in the brain to die. These changes make it hard for a person to remember things, have clear thinking, and make good judgments. The symptoms  begin slowly and get worse over time.
(pronounced klin-uh-kuhl try-uhl)
A research study to find out if new treatments are safe and effective. Healthy people and people with Alzheimer’s disease can choose to take part in a clinical trial. 
A serious medical illness that can be treated. Some signs of depression  are:
- feeling sad for more than a few weeks at a time
- having trouble sleeping
- losing interest in things you like to do
Depression can cause people to be confused and forgetful.
Mild cognitive impairment
(pronounced mild kog-ni-tiv im-pair-ment)
Also called MCI . It is a medical condition that causes people to have more memory problems than other people their age. The signs of MCI are not as severe as those of Alzheimer’s disease.