How does the brain change in response to experience, learning and injury through neuroplasticity?
Explain neuroplasticity, including developmental and adaptive plasticity, and how experience and injury reshape neural connections
WACE Year 12 Psychology Unit 3: neuroplasticity, developmental versus adaptive plasticity, synaptic pruning, long-term potentiation, and how experience and brain injury reshape neural pathways across the lifespan.
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What this dot point is asking
SCSA asks you to define neuroplasticity, distinguish its main types, and explain how experience and injury physically change the brain. This connects the biological bases of behaviour to learning and memory, because every new skill or memory corresponds to a change in neural connections.
What neuroplasticity is
The brain is not a fixed organ. Neuroplasticity is the capacity of the nervous system to change its structure and function across the lifespan in response to stimulation, learning, experience and damage. These changes happen at the level of synapses (the connections between neurons), which can be strengthened, weakened, formed or eliminated.
Developmental plasticity
Developmental plasticity refers to the changes that occur as the brain matures from infancy to adulthood. Two key processes are involved.
- Synaptogenesis is the rapid creation of huge numbers of synapses in early life, giving the young brain an overabundance of connections.
- Synaptic pruning is the elimination of connections that are rarely used, while frequently used connections are retained and strengthened. Pruning makes the brain more efficient by following a use-it-or-lose-it principle.
This is why early childhood is a sensitive period for skills such as language: the developing brain is especially responsive, and pathways that are stimulated become hardwired while neglected ones are pruned away.
Adaptive plasticity
Adaptive plasticity refers to changes that occur in response to learning or after damage, throughout life.
- Through learning, repeated activation of a pathway strengthens it. Long-term potentiation is the lasting strengthening of synaptic connections that fire together repeatedly, and is widely regarded as the cellular basis of learning and memory.
- After injury, two mechanisms can restore some function. Rerouting allows an undamaged neuron to form a new connection to replace a damaged one, and sprouting is the growth of new nerve fibres (dendritic branches) to make new links. Healthy regions can also take over functions previously handled by a damaged region.
Experience and the environment
Enriched environments, with stimulation, novelty and challenge, promote denser neural connections, while deprived environments slow development. Studies of rats raised in enriched cages found heavier, more connected cortices than rats raised in bare cages, demonstrating that experience physically shapes the brain.
In humans, this principle explains why practising a skill (a musical instrument, a second language) literally remodels the relevant brain regions, and why rehabilitation after stroke or injury works: targeted, repeated practice drives the rerouting and sprouting that recover lost function.
Why this matters
Neuroplasticity reframes the brain as dynamic rather than fixed. It explains how learning is stored, why early experience is so influential, and why recovery from brain injury is possible. It also cautions against the myth that the adult brain cannot change; plasticity declines with age but never stops entirely.