Abstract The associative net model of heteroassociative memory with binaryvalued synapses has been extended to include recent experimental data that indicates that in the hippocampus one form of synaptic modification is a change in the probability of synaptic transmission . Pattern pairs are stored in the net by a version of the Hebbian learning rule that changes the probability of transmission at synapses where the presynaptic and postsynaptic units are simultaneously active from a low, base value to a high, modified value. Numerical calculations of the expected recall response have been used to assess the performance for different values of the base and modified probabilities. If there is a cost incurred with generating the difference between these probabilities, then the optimal difference is around 0.4. Performance can be greatly enhanced by using multiple cue presentations during recall
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