Talk Matt Gilson - Friday 07/15 - 12pm - UPF Tanger

Hi colleagues,

this Friday (July 15th) at noon Matt Gilson will be giving a talk
UPF, C/ Tánger 122-140, room 55.410, 08018 Barcelona
See title / abstract below.
Hope to see you there,
 
Tim
 
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Stability versus Neuronal Specialization for STDP: Long-Tail Weight Distributions Solve the Dilemma

Spike timing-dependent plasticity (STDP) is hypothesised to structure neuronal networks in the brain depending on their precise spiking activity. In this talk, we focus on the functional implications of an experimentally observed property of STDP, the dependence of the weight update on the current strength of the synaptic weight. This weight dependence crucially shapes the distribution of plastic synaptic strengths. We propose a model of weight-dependent STDP that can generate long-tail (e.g., lognormal) distribution of synaptic strengths that have been observed in recent experiments. We show that our new model 'log-STDP' offers a balance between stability for the weight distribution and competition induced by input spike-time correlations, taking the "best" of additive and multiplicative STDP. This allows a neuron to robustly and quickly adapt to changes in the structure of input spike trains, e.g., in a context of short-term memory for example. In a recurrently connected network, log-STDP allows the persistence of a stable weight structure susceptible to represent the structure of input spike trains.

 

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