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The calcium control hypothesis. (A) The Ω function: when [Ca]I < θd, the synaptic weight vector stays at the basal level; when θd < [Ca]i < θp, the synaptic weight is reduced (LTD); for [Ca]i > θp, the synaptic weight is increased (LTP). (B) The learning rate η as a function of intracellular calcium.
