The symptoms are caused by the degeneration and loss of neurons in the brain, particularly those crucial for the initiation and coordination of movement. (sciencedaily.com)
HIV / Dementia and psychosis - Occurs in advanced infection, can affect all ages, advanced infection is thought to cause loss of neurons, many traditional anti-HIV drugs don't work in the brain because they can't cross the blood - brain barrier (discovermagazine.com)
Inside the brain, Alzheimer's disease is characterized by loss of neurons, and presence of abnormal tangles and plaques in the brain. (sciencedaily.com)