Hebbian Theory: Neurons That Fire Together, Wire Together
Donald Hebb · 1949
"Learning is physical — repeated co-activation between neurons strengthens the connection between them, which is how experience becomes structure."
Hebb's 1949 rule is the closest thing neuroscience has to a founding law: neurons that fire together, wire together. Every habit, skill, and memory is this rule running on repeat.
Hebb proposed that when one neuron repeatedly helps fire another, the connection between them physically strengthens, becoming more efficient next time. This synaptic plasticity is now the accepted basis for how memory and learning are encoded at the cellular level, decades before brain imaging could confirm it. It also explains why repetition builds skill, and why breaking a habit means weakening a wired pathway, not just willing it away.
According to Hebbian theory, what physically changes in the brain when learning occurs?
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The explanation above is written with AI assistance. These are the originals — go to them to check it.
- Hebbian TheoryWikipedia
- Donald Olding HebbCanadian Association for Neuroscience
Neuroplasticity: The Brain That Changes Itself
"The brain physically rewires itself in response to repeated thought and behavior throughout adulthood, not just childhood — meaning habits, skills, and even chronic thought patterns are more changeable at a neural level than 'fixed personality' framing suggests."