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Development of multiple cognitive deficits manifested by both memory impairment (impaired ability to learn new information or recall previously learned information) and one or more of the following cognitive disturbances: • aphasia (language disturbance) • apraxia (impaired ability to carry ... [full story]

Some researchers believe that a decline in growth factors or an increase in factors that are toxic to neuronal cells causes AD. Researchers are investigating introducing naturally occurring nerve growth factor (NGF) into the brain to stimulate brain cell growth ... [full story]

Defects in brain blood vessels such as cerebroarteriosclerosis or problems in the blood-brain barrier (which guards against foreign bodies or toxic agents in the blood stream from entering the brain) have not been identified as causes of AD. [full story]

The discovery of slow-acting viruses that cause some brain disorders has resulted in some researchers believing that a virus may cause AD. As of 2002, no virus had been identified in the brains of those with AD. [full story]

The body’s immune system may attack its own tissues and produce antibodies against essential cells. Some researchers postulate that aging neurons in the brain trigger an autoimmune response that causes AD. Antibodies have been identified in the brains of those ... [full story]