What is defined as a deficiency in the ability to think, perceive, reason, or remember?

Cognitive impairment is characterized by difficulties in mental processes such as thinking, perception, reasoning, and memory. This condition can range from mild to severe and affects an individual's ability to perform everyday tasks, make decisions, and interact socially. Cognitive impairment encompasses various disorders, including dementia and certain types of brain injury, highlighting its impact on mental functions.

Physical disability refers to limitations in physical functioning, which does not inherently include cognitive aspects. Medical necessity pertains to healthcare services that are essential for the diagnosis or treatment of a condition rather than the mental deficiencies described. Supportive care involves assistance with daily activities due to various health issues but does not specifically address cognitive functions. Therefore, cognitive impairment is the most accurate term for the deficiency in mental abilities outlined in the question.