“…Not infrequently seen in the aging brain are momentary (i.e., transient ischemic attack) ( 18 ), permanent impairment, functional disability, and personality changes ( 19 ), which can vary greatly in severity and progression. Aging brains may oftentimes be associated with deficiencies in various regions of the nervous system responsible for vestibular function and motor control (e.g., reduced reaction time, impaired coordinative movements), speech and language function (e.g., anomias), thinking (e.g., confusion, disorientation), sensory perception, learning, mental fatigue, attention, judgment, problem solving (e.g., agnosias, apraxias), ADL and instrumental ADL (e.g., dressing, eating, personal hygiene, shopping, house work, transportation) sleeping, mood (e.g., depression and melancholy), behavioral changes (e.g., stress, anxiety, confusion or delirium, fear, loneliness/isolation) ( 20 ), and disorganized behavior and doing unusual things (e.g., shouting, undressing in public).…”