Neuroplasticity
Neuroplasticity is the brain's ability to change its structure and function in response to experience, learning, injury, or disease — throughout the lifespan.
What neuroplasticity is
Neuroplasticity — also called neural plasticity or brain plasticity — is the brain's capacity to reorganize its structure, function, and connections in response to experience, learning, injury, or developmental change. The term encompasses multiple distinct phenomena: synaptic plasticity (strengthening or weakening of synaptic connections based on use), structural plasticity (changes in neuronal morphology and connectivity), and neurogenesis (the formation of new neurons, which in adults occurs primarily in the hippocampus).
The concept of neuroplasticity replaced an earlier view that the adult brain was a fixed, unchanging structure. We now know that the brain retains significant plasticity throughout life, though the type, extent, and ease of change differ between developmental periods and across aging.
Neuroplasticity operates through several mechanisms. Long-term potentiation (LTP) — the strengthening of synaptic connections through repeated activation — is the cellular basis of memory formation. BDNF (brain-derived neurotrophic factor) plays a critical role by promoting neuronal survival, axonal sprouting, and synaptic strengthening. Exercise, learning, and social engagement all elevate BDNF and enhance plasticity.
Why it matters for cognitive health
Neuroplasticity is the biological foundation of cognitive reserve. When new skills are learned, new neural pathways are created. When existing knowledge is deepened, synaptic networks are strengthened. When one brain region is damaged, adjacent regions can sometimes take over its function through compensatory plasticity. All of these processes depend on the brain's capacity for plastic change.
In the context of aging and cognitive decline, neuroplasticity has two implications. First, maintaining high levels of cognitive and physical engagement throughout life promotes plasticity and builds reserve against future decline. Second, the brain retains some capacity for recovery and adaptation even in the presence of disease — which is why cognitive rehabilitation approaches can improve function in some people with MCI and early dementia.
Maladaptive plasticity also exists: chronic stress, sleep deprivation, and some medications can produce plastic changes that impair cognitive function. This is why some negative cognitive changes associated with chronic stress or poor sleep are not simply temporary — they can reflect structural changes that take time to reverse.
Frequently asked questions
Does neuroplasticity decline with age?
Yes, but not completely. The brain's plasticity is greatest in childhood and declines progressively with age. However, adults retain significant capacity for synaptic and structural change throughout life, particularly in response to learning and exercise. Neurogenesis in the hippocampus also continues into old age, though at reduced rates. The adult brain is less plastic than the developing brain but far from rigid.
Can brain training apps improve neuroplasticity?
The evidence is mixed and has been a subject of significant scientific debate. While practicing cognitive tasks produces skill improvements in those specific tasks, the evidence that commercial brain training produces broad neuroplastic benefits that generalize to everyday cognitive function is weak. Physical exercise has a more consistent and broader evidence base for promoting neuroplasticity, including hippocampal volume maintenance and BDNF elevation.
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