_______ is the global term for any neurological disorder in which the primary symptoms involve a deterioration of mental functioning.

Dementia is a general term that represents a group of diseases and illnesses that affect your thinking, memory, reasoning, personality, mood and behavior.
The decline in mental function interferes with your daily life and activities.
It’s estimated that about 50% of people age 85 and older have dementia. Current medications may help slow the mental decline.
Dementia is caused by damage to or changes in the brain. Common causes of dementia are: Alzheimer's disease. This is the most common cause of dementia.
Any neurological illness in which a decline in mental function is one of the key symptoms is referred to as dementia. Although there isn't one particular illness that causes dementia, many illnesses can.
Memory loss is a common symptom of dementia, but it can have many different causes. Memory loss alone does not necessarily indicate dementia, despite the fact that it is frequently one of the first symptoms of the illness.

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