Dementia is a condition describing the partial or total loss of cognitive abilities of an individual. This decrease in higher functions is irreversible and its appearance is generally progressive. Dementia affects memory, attention, and learning abilities, and leads to a loss of acquired sensory, cognitive, motor, and sometimes behavioral skills. Dementia is the result of many neurological diseases which involve the progressive degeneration of certain neurons: they are called neurodegenerative diseases, the best known is Alzheimer's disease. There are also forms of dementia called vascular, due to the death of brain cells by stopping their blood supply.
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. Translated by Jeff