The distribution of synaptic input sums to a sample memory neuron for all 30,000 memory items in the case of a RP. The red line (drawn for a refined scale in the inset) marks the optimal value of the neuron threshold for minimizing the relative dissimilarity for a masking fraction of 33%. Moving the threshold to a lower value would result in the inclusion of this neuron in a significantly larger number of memory traces, thereby increasing their overlap.
