The glutamatergic AMPA receptor-mediated EPSC model was derived from granule cells and the maximum synaptic conductance was balanced to reproduce a single pf EPSC (Barbour, 1993; Isope and Barbour, 2002). Release probability was adapted to account for pair-pulse facilitation (Zhang et al., 2015). The aa synapses were made with identical physiological properties as the pf synapses (Walter et al., 2009). The AMPA synapse parameters were: release probability = 0.13, τREC = 35.1 ms, τfacil = 54 ms, τI = 6 ms, Gmax of 2800 pS, reversal potential = 0 mV. The model as a whole faithfully reproduced the response to random pf stimulations (Dittman et al., 2000). The number of synapses was adjusted to imitate experimental observations of pf bursts that elicited excitatory 250 Hz spike burst in the PC soma (Walter and Khodakhah, 2006).