Modeling the STDP symmetry-to-asymmetry transition in the presence of gabaergic inhibition

Citation

Cutsuridis V, Cobb SR & Graham B (2009) Modeling the STDP symmetry-to-asymmetry transition in the presence of gabaergic inhibition. Neural Network World, 19 (5), pp. 471-481. http://www.nnw.cz/obsahy09.html

Abstract
Experimental studies have shown a symmetry-to-asymmetry transition of the spike-timing dependent plasticity (STDP) curve exists in the proximal stratum radiatum (SR) dendrite of the hippocampal CA1 pyramidal neuron, which is probably due to the presence of GABAergic inhibition [2, 3, 4]. A recent computational model predicted that symmetry-to-asymmetry transition is strongly dependent on the frequency and conductance value of GABA inhibition and that the largest long term potentiation (LTP) value and the two distinct long-term depression (LTD) tails of the symmetrical STDP curve are centred at +10 ms, +40 ms and -10 ms, respectively [8, 9]. In the present paper, we continue to investigate even further via computer simulations the effects of gamma frequency inhibition and its conductance value to the symmetry-to-asymmetry transition of the STDP profile in the SR dendrite and predict that the transition is even more robust when there is a temporal offset between the onsets of the pre-post excitatory stimulation and the GABAergic inhibition. The largest LTP value and the two distinct LTD tails are inversely proportional to the increase of GABA conductance.

Keywords
CA1 pyramidal neuron; Calcium; Computer model; GABA; Hippocampus; LTD; LTP; STDP

Journal
Neural Network World: Volume 19, Issue 5