A two-signal (heterosynaptic) synaptic update rule reduces to preconditioned gradient descent at its stationary point, provided consistency scores across neurons share a sign, unifying Hebbian, anti-Hebbian and heterosynaptic plasticity.
Hebbian plasticity in vivo: relevance and induc- tion
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Heterosynaptic Circuits Are Universal Gradient Machines
A two-signal (heterosynaptic) synaptic update rule reduces to preconditioned gradient descent at its stationary point, provided consistency scores across neurons share a sign, unifying Hebbian, anti-Hebbian and heterosynaptic plasticity.