Reducing the Variability of Neural Responses: A Computational Theory of Spike-Timing-Dependent Plasticity

Authors:
Sander M. Bohte;Michael C. Mozer
Affiliations:
Netherlands Centre for Mathematics and Computer Science (CWI), 1098 SJ Amsterdam, The Netherlands, sbohte@cwi.nl;Department of Computer Science, University of Colorado, Boulder, CO, U.S.A., mozer@colorado.edu
Venue:
Neural Computation
Year:
2007

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Abstract

Experimental studies have observed synaptic potentiation when a presynaptic neuron fires shortly before a postsynaptic neuron and synaptic depression when the presynaptic neuron fires shortly after. The dependence of synaptic modulation on the precise timing of the two action potentials is known as spike-timing dependent plasticity (STDP). We derive STDP from a simple computational principle: synapses adapt so as to minimize the postsynaptic neuron's response variability to a given presynaptic input, causing the neuron's output to become more reliable in the face of noise. Using an objective function that minimizes response variability and the biophysically realistic spike-response model of Gerstner (2001), we simulate neurophysiological experiments and obtain the characteristic STDP curve along with other phenomena, including the reduction in synaptic plasticity as synaptic efficacy increases. We compare our account to other efforts to derive STDP from computational principles and argue that our account provides the most comprehensive coverage of the phenomena. Thus, reliability of neural response in the face of noise may be a key goal of unsupervised cortical adaptation.