Figure 5.

(A) Fast gamma will not synchronize with a delay of 13 ms. If the long distance E-E coupling is turned on (c_ee = 0.5), synchrony still does not occur. However, if the AHP is then turned on (g_m = 1), the network shifts to a beta rhythm and synchronizes within two cycles. Parameters are as in the Appendix. Excitatory drive is 6 in one site and 6.5 in the other; inhibitory drive is 1.15 in both sites. The voltages of the two E-cells are represented by black and gray lines. (B) The main role played by the long-distance E-E connections is to prevent the anti-phase solution. For the first 400 ms, there is no long E-E connection. At t = 400, c_ee = 0.05, which induces synchrony within a few cycles. At t = 400, c_ee is reset to zero, but synchrony remains robust. Drives and AHP are as in A.