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. Author manuscript; available in PMC: 2015 Mar 1.
Published in final edited form as: Network. 2014 Mar;25(0):38–62. doi: 10.3109/0954898X.2014.886781

Figure 3.

Figure 3

Periodic forcing of a CA1 pyramidal neuron. A. Experimental procedure for a train of depolarizing (A1) or hyperpolarizing (A2) pulses. B. Vector strength of phase locking for experiments at different ratios of forcing frequency to intrinsic frequency of the neuron at a given level of steady applied current. For depolarizing stimulus trains in B1, there were clear plateaus in vector strength corresponding to 1:1 and 1:2 locking. The vector strength for hyperpolarizing trains in B2 rarely exceeded 0.8 and no plateaus were evident. C. Plots of the ratio of the forcing frequency to the forced frequency for the biological neuron versus the ratio of the forcing frequency versus the free-running frequency immediately before the experiment show plateaus corresponding to 1:1 and 1:2 locking for depolarizing trains (C1) but not hyperpolarizing trains (C2).