Dementia:A chronic or persistent disorder marked by mental processes caused by brain disease or injury characterized by memory disorders, personality changes, and impaired reasoning.
Delirium: An acutely disturbed state of mind characterized by restlessness, illusions, and incoherence occurring in intoxication or medically ill individuals.
Amnestic Disorder: A disorder characterized by severe memory impairment without other significant cognitive loss typically due to damage to the brain from physical trauma or disease.