Cognitive reserve

Cognitive reserve, developed and formalised by Yaakov Stern building on earlier brain-reserve work (Katzman and colleagues, late 1980s), refers to the brain's functional adaptability — built through education, complex work, multilingualism, and lifelong learning. It is distinguished from brain reserve, the structural or biological capacity often operationalised via measures of brain integrity and size. Higher cognitive reserve is associated with better cognitive outcomes for a given level of pathology. In longevity science, it is a central modifiable target of brain-health interventions, helping postpone dementia symptoms.