Scientists ‘Reprogram’ Mouse Cortical Neurons With Light

In 1949 psychologist Donald Hebb built a theory for how neurons in the brain behave during the learning process — basically, neurons that fire together wire together.

Hebbs theorized that stimulating a group of neurons together causes these cells to then stick together and form a group — a neuronal ensemble. Repeatedly activating the ensemble, he believed, strengthened the connections between them, allowing them to all fire more efficiently. Today, Hebbian theory underlies biological expl

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