Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2011-07-06
J. Stat. Mech. (2011) P09025
Physics
Condensed Matter
Disordered Systems and Neural Networks
31 pages, 17 figures. A few updates and other minor changes
Scientific paper
10.1088/1742-5468/2011/09/P09025
The idea of using metaplastic synapses to incorporate the separate storage of long- and short-term memories via an array of hidden states was put forward in the cascade model of Fusi et al. In this paper, we devise and investigate two models of a metaplastic synapse based on these general principles. The main difference between the two models lies in their available mechanisms of decay, when a contrarian event occurs after the build-up of a long-term memory. In one case, this leads to the conversion of the long-term memory to a short-term memory of the opposite kind, while in the other, a long-term memory of the opposite kind may be generated as a result. Appropriately enough, the response of both models to short-term events is not affected by this difference in architecture. On the contrary, the transient response of both models, after long-term memories have been created by the passage of sustained signals, is rather different. The asymptotic behaviour of both models is, however, characterised by power-law forgetting with the same universal exponent.
Luck Mck. J.
Mehta Anita
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