What is Synaptic plasticity?
Synaptic plasticity is the ability of synapses (connections between neurons) to strengthen or weaken over time in response to activity. It is the fundamental neural mechanism underlying learning, memory, and adaptive behavior.
How it works
Synaptic plasticity encompasses both long-term potentiation (strengthening) and long-term depression (weakening). The strength of a synapse depends on the pattern and history of its activation: frequently co-activated synapses strengthen (Hebbian learning), while synapses that are active without producing useful outcomes weaken. This dynamic reshaping of neural connections is what enables the brain to store information, form habits, and adapt to new environments. Plasticity continues throughout life, though it is highest during developmental critical periods.
Applied example
Every time a person practices a musical instrument, the synapses in the motor and auditory cortex that support that specific motor pattern are strengthened through synaptic plasticity. Over thousands of hours, these connections become so strong that the musician can perform complex sequences automatically.
Why it matters
Synaptic plasticity is the physical basis of all learning and behavior change: when we say the brain ‘changes,’ we are describing the strengthening and weakening of trillions of synaptic connections.
