Dementia is an umbrella term that describes the symptoms of cognitive diseases. These include having problems with thinking that are severe enough to interfere with normal activities of daily living lasting longer than six months. Different types of dementia affect different areas of the brain, particularly in the early stages of any given disease.
Alzheimer’s disease, the most common type of dementia, most often destroys neurons and their connections in parts of the brain that are involved in the functions of memory. These include the entorhinal cortex and hippocampus. Later, the cerebral cortex, which is responsible for language, reasoning, and social behavior is also affected. This scenario is considered typical however some people show symptoms of impaired reasoning and judgment before their memory problems are evident.