288 pp. per issue
6 x 9, illustrated
2014 Impact factor:

Neural Computation

November 2013, Vol. 25, No. 11, Pages 2815-2832
(doi: 10.1162/NECO_a_00512)
© 2013 Massachusetts Institute of Technology
A Biological Gradient Descent for Prediction Through a Combination of STDP and Homeostatic Plasticity
Article PDF (353.03 KB)

Identifying, formalizing, and combining biological mechanisms that implement known brain functions, such as prediction, is a main aspect of research in theoretical neuroscience. In this letter, the mechanisms of spike-timing-dependent plasticity and homeostatic plasticity, combined in an original mathematical formalism, are shown to shape recurrent neural networks into predictors. Following a rigorous mathematical treatment, we prove that they implement the online gradient descent of a distance between the network activity and its stimuli. The convergence to an equilibrium, where the network can spontaneously reproduce or predict its stimuli, does not suffer from bifurcation issues usually encountered in learning in recurrent neural networks.