Figure 1

Illustration of the main principles of the model. (a) Example of five connection states with approximate drawings of spine shapes and two transition probabilities. (b) A new memory, mapping three input to twenty output neurons, initially with many weak (State 2) connections. (c) The same memory at a much later time: most connections have disappeared, and a few have become strong (States 4 and 5) due to random fluctuations.