Cognitive Impairment Mild cognitive impairment—AKA brain fog, senior moment, or "where did I put my keys... again?"—is a slight but noticeable decline in memory, learning, language, thinking or judgment. And memory. Other Terms Cerebrum Our brains’ mission control panel – it’s amazing! Chronic A categorization for long-term illnesses. Clinical Trials Breaking ground in science to bring new kinds of care. Clinically isolated syndrome A one-off ‘attack’ of the body’s own immune system. View More