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. Author manuscript; available in PMC: 2013 Jun 6.
Published in final edited form as: Network. 2003 Feb;14(1):137–150.

Figure 3.

Figure 3

Response statistics to 500 Hz periodically modulated Poisson input. (A) Period histogram of the stimulus (top) and response (bottom). The presence of IKLT sharpens the synchronization, but also reduces the mean firing rate. Note that because the stimulus is weak firings are infrequent (about one in 25 cycles). (B) Histograms of interspike intervals, ISIs. (C) Vector strength versus period of the stimulus. The presence of IKLT in the model increases the tightness of phase-locking. The faster kinetics of the current enhances vector strength even more. The light dotted vertical line (here, and in panels (D) and (E)) denotes control parameter values (as used in figure 1). (D) The rate of firing increases with the stimulus period. (E) Vector strength decreases as a function of the mean synaptic potential amplitude. Note that the difference in phase-locking precision between the LIF models with and without IKLT is decreasing for stronger inputs. The inset shows rotation number, the average number of spikes per stimulus period, versus the mean synaptic potential amplitude. (F) Vector strength decreases with increasing membrane or synaptic current time constant. For the model with IKLT the decrease of VS is more gradual with a decrease of time constants.