Fig. 2.

Dynamics of the synaptic and depression variables. A schematic associated with the AB synapse is shown. At the moment (marked by arrow) AB becomes active, the s variable (solid) is reset to the current value of d (dashed). At all other times, the two variables are decoupled and governed by distinct sets of equations. During the time AB is active, s decays at a slow rate and d depresses. Once AB becomes inactive, s decays at a different rate, while d recovers. The s and d variables for the LP and PY synapses behave in a similar manner.