Entrainment in the dynamic spike-blocking model as a function of the transition voltage, Vt . A: Example traces of synaptic current, threshold, and membrane voltage for a 600 Hz tone and a 1000 Hz tone, with Vt = 0.4. B: EI versus frequency for Vt equal to 0.1, 0.4, 0.6, and .9. C: EI versus Vt for a 100 Hz tone and an 800 Hz tone. N = 400, N · Gα = 10.