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A Mathematical Model of the Cerebellar-Olivary System I: Self-Regulating Equilibrium of Climbing Fiber Activity

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Abstract

We use a mathematical model to investigate how climbing fiber-dependent plasticity at granule cell to Purkinje cell (gr→Pkj) synapses in the cerebellar cortex is influenced by the synaptic organization of the cerebellar-olivary system. Based on empirical studies, gr→Pkj synapses are assumed to decrease in strength when active during a climbing fiber input (LTD) and increase in strength when active without a climbing fiber input (LTP). Results suggest that the inhibition of climbing fibers by cerebellar output combines with LTD/P to self-regulate spontaneous climbing fiber activity to an equilibrium level at which LTP and LTD balance and the expected net change in gr→Pkj synaptic weights is zero. The synaptic weight vector is asymptotically confined to an equilibrium hyperplane defining the set of all possible combinations of synaptic weights consistent with climbing fiber equilibrium. Results also suggest restrictions on LTP/D at gr→Pkj synapses required to produce synaptic weights that do not drift spontaneously.

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Authors and Affiliations

  1. Department of Neurobiology and Anatomy, University of Texas Medical School at Houston, Houston, Texas, 77030

    Garrett T. Kenyon, Javier F. Medina & Michael D. Mauk

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  1. Garrett T. Kenyon
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  2. Javier F. Medina
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  3. Michael D. Mauk
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Kenyon, G.T., Medina, J.F. & Mauk, M.D. A Mathematical Model of the Cerebellar-Olivary System I: Self-Regulating Equilibrium of Climbing Fiber Activity. J Comput Neurosci 5, 17–33 (1998). https://doi.org/10.1023/A:1008874209991

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