Synaptic Plasticity

Synaptic plasticity — long-term potentiation and depression, dendritic spine remodelling and synaptogenesis — underpins learning and memory. Brain-derived neurotrophic factor is the most cited mediator, and aerobic exercise is the most reliable way to raise it in humans. Sleep, particularly slow-wave and REM, is when synaptic consolidation and pruning occur, making sleep deprivation directly plasticity-impairing. Most nootropic marketing extrapolates from rodent BDNF or hippocampal slice data to human cognition, a leap the trials do not support. Novel, effortful learning remains the only intervention that reliably remodels synapses.

1) Learn something genuinely difficult and novel — a language, instrument or complex skill — since effortful learning is the direct stimulus for synaptic remodelling. 2) Do regular aerobic exercise, the most reliable human BDNF elevator with hippocampal volume evidence. 3) Sleep sufficiently, as consolidation and synaptic homeostasis occur during slow-wave and REM sleep. 4) Space and interleave practice rather than cramming, which produces stronger durable encoding. 5) Keep inflammation and metabolic dysfunction low, both of which impair plasticity. 6) Maintain social and cognitive engagement, associated with cognitive reserve. 7) Get adequate omega-3s for membrane fluidity and synaptic function. 8) Avoid chronic alcohol, which directly impairs long-term potentiation.

• •Effortful novel learning
• •Aerobic exercise
• •Sleep sufficiency
• •Spaced and interleaved practice
• •Metabolic and inflammatory control
• •Social and cognitive engagement
• •Alcohol avoidance