Voltage trace (A) and phase plane trajectory
(B) of a rebound depolarization driven by a conditioned
stimulus in a model DCN neuron, following
training with an intermediate interstimulus int erval
(ISI) of 90 ms. The stochastic arrival times of
synaptic inputs leads to variations in the voltage dynamics
between the 20 traces shown, despite identical initial
conditions at t = -100 ms (red and blue traces). This
ISI value leads to unreliable retrieval of the stored
memory. Noisy synaptic inputs lead some phase plane trajectories
(red dots) closer to the reliable retrieval zone (warm
colors in color map) and toward a higher level of deinactivation
of T-type Ca2+ channels, while other trajectories are
more distant from the reliable retrieval zone (blue dots).
